Open Access

Health related quality of life measure in systemic pediatric rheumatic diseases and its translation to different languages: an international collaboration

  • Lakshmi Nandini Moorthy1Email author,
  • Elizabeth Roy2,
  • Vamsi Kurra2,
  • Margaret GE Peterson3,
  • Afton L Hassett4,
  • Thomas JA Lehman3,
  • Members of our collaborative group,
  • Christiaan Scott5,
  • Dalia El-Ghoneimy6,
  • Shereen Saad7,
  • Reem El Feky7,
  • Sulaiman Al-Mayouf8,
  • Pavla Dolezalova9,
  • Hana Malcova10,
  • Troels Herlin11,
  • Susan Nielsen12,
  • Nico Wulffraat13,
  • Annet van Royen14,
  • Stephen D Marks15,
  • Alexandre Belot16,
  • Jurgen Brunner17,
  • Christian Huemer18,
  • Ivan Foeldvari19,
  • Gerd Horneff20,
  • Traudel Saurenman21,
  • Silke Schroeder21,
  • Polyxeni Pratsidou-Gertsi22,
  • Maria Trachana22,
  • Yosef Uziel23,
  • Amita Aggarwal24,
  • Tamas Constantin25,
  • Rolando Cimaz26,
  • Theresa Giani26,
  • Luca Cantarini27,
  • Fernanda Falcini28,
  • Silvia Magni Manzoni29,
  • Angelo Ravelli30,
  • Donato Rigante31,
  • Fracnceso Zulian32,
  • Takako Miyamae33,
  • Shumpei Yokota33,
  • Juliana Sato34,
  • Claudia S Magalhaes34,
  • Claudio A Len35,
  • Simone Appenzeller36,
  • Sheila Oliveira Knupp37,
  • Marta Cristine Rodrigues38,
  • Flavio Sztajnbok39,
  • Rozana Gasparello de Almeida39,
  • Adriana Almeida de Jesus40,
  • Lucia Maria de Arruda Campos40,
  • Clovis Silva41,
  • Calin Lazar42,
  • Gordana Susic43,
  • Tadej Avcin44,
  • Ruben Cuttica45,
  • Ruben Burgos-Vargas46,
  • Enrique Faugier47,
  • Jordi Anton48,
  • Consuelo Modesto49,
  • Liza Vazquez50,
  • Lilliana Barillas51,
  • Laura Barinstein52,
  • Gary Sterba53,
  • Irama Maldonado54,
  • Seza Ozen55,
  • Ozgur Kasapcopur56,
  • Erkan Demirkaya57 and
  • Susa Benseler58
Pediatric Rheumatology201412:49

https://doi.org/10.1186/1546-0096-12-49

Received: 20 June 2014

Accepted: 28 September 2014

Published: 25 November 2014

Abstract

Background

Rheumatic diseases in children are associated with significant morbidity andpoor health-related quality of life (HRQOL). There is no health-relatedquality of life (HRQOL) scale available specifically for children with lesscommon rheumatic diseases. These diseases share several features withsystemic lupus erythematosus (SLE) such as their chronic episodic nature,multi-systemic involvement, and the need for immunosuppressive medications.HRQOL scale developed for pediatric SLE will likely be applicable tochildren with systemic inflammatory diseases.

Findings

We adapted Simple Measure of Impact of Lupus Erythematosus in Youngsters(SMILEY©) to Simple Measure of Impact of Illness in Youngsters(SMILY©-Illness) and had it reviewed by pediatric rheumatologists forits appropriateness and cultural suitability. We tested SMILY©-Illnessin patients with inflammatory rheumatic diseases and then translated it into28 languages.

Nineteen children (79% female, n=15) and 17 parents participated. The meanage was 12±4 years, with median disease duration of 21 months (1-172months). We translated SMILY©-Illness into the following 28 languages:Danish, Dutch, French (France), English (UK), German (Germany), German(Austria), German (Switzerland), Hebrew, Italian, Portuguese (Brazil),Slovene, Spanish (USA and Puerto Rico), Spanish (Spain), Spanish(Argentina), Spanish (Mexico), Spanish (Venezuela), Turkish, Afrikaans,Arabic (Saudi Arabia), Arabic (Egypt), Czech, Greek, Hindi, Hungarian,Japanese, Romanian, Serbian and Xhosa.

Conclusion

SMILY©-Illness is a brief, easy to administer and score HRQOL scale forchildren with systemic rheumatic diseases. It is suitable for use acrossdifferent age groups and literacy levels. SMILY©-Illness with itsavailable translations may be used as useful adjuncts to clinical practiceand research.

Findings

Introduction

In children, chronic rheumatic diseases are associated with significant disease-and treatment-related morbidity, thus impacting their health-related quality oflife (HRQOL). There are generic scales available to assess HRQOL in childrenwith rheumatic diseases such as the Pediatric Quality of Life Inventory(PedsQL)-Rheumatology module [1]. But there is no specific health-related quality of life (HRQOL)scale that addresses the impact of the less common rheumatic diseases such asmixed connective tissue disease (MCTD), juvenile dermatomyositis (JDM), systemicsclerosis (SS), Sjögren’s syndrome, vasculitides, Behçets,sarcoidosis or systemic arthritis (SJIA).

Simple Measure of the Impact of Lupus Erythematosus in Youngsters©" (SMILEY)is valid in US-English [2] and in Portuguese-for Brazil [3]. SMILEY-US English was validated through a multicenter study in theUS [2]. Subjects with SLE completed other gold standards and SLE statusmeasures and psychometric properties were determined [2]. Relationship of HRQOL and changes in disease activity were measuredover time [4]. SMILEY US English was further translated and adapted into severallanguages [2, 5, 6].

Hypothesis

Systemic Lupus Erythematosus (SLE) and systemic inflammatory diseases shareseveral features such as their chronic episodic nature, multi-systemicinvolvement, and the need for immunosuppressive medications. HRQOL scaledeveloped for pediatric SLE will be applicable to children with systemicinflammatory diseases. We decided to adapt a tool that is valid in SLE, titled,SMILEY [2]. We will report the: (i) adaptation of SMILEY© to Simple Measureof Impact of Illness in Youngsters (SMILY©-Illness) for use in childrenwith systemic inflammatory diseases such as MCTD, JDM, SS, Sjögren’ssyndrome, vasculitis and SJIA and preliminary testing in patients; and (ii)translation into different languages. We think this is very important since thesystemic rheumatic diseases mentioned above can lead to significant disabilitywhich impact HRQOL.

Methods used

Overview in brief

(i) We adapted SMILEY to SMILY©- Illness and had it reviewed by pediatric rheumatologists from two centers (RWJMS, HSS) for its appropriateness and cultural suitability, and tested SMILY©- Illness in as small sample. We examined time taken to complete questionnaire, feasibility, and also collected demographic and disease-related data. We subsequently translated it into the following 28 languages using professional translators: Danish, Dutch, French (France), English (UK), German (Germany), German (Austria), German (Switzerland), Hebrew, Italian, Portuguese(Brazil), Slovene, Spanish (USA and Puerto Rico), Spanish (Spain), Spanish (Argentina), Spanish (Mexico), Spanish (Venezuela ), Turkish, Afrikaans, Arabic (Saudi Arabia), Arabic (Egypt), Czech, Greek, Hindi, Hungarian, Japanese, Romanian, Serbian and Xhosa. Each translation was reviewed by the pediatric rheumatologist(s) from that country for its applicability and cultural suitability in order to be approved.

Subjects and settings

Children ≤18 years of age diagnosed with the following systemic chronicrheumatic diseases were included: MCTD, JDM, Sjögren’s syndrome,Systemic sclerosis/CREST, Behçets, sarcoidosis and SJIA. The patients whohad to have been followed for at least one month, and able to participate in thestudy as determined by the pediatric rheumatologist, and their parents (orguardians) were recruited from two US pediatric rheumatologypracticesa. Children were excluded if they were unable tocomplete the questionnaires, or had a significant co-morbid condition likely toimpact HRQOL exclusive of their rheumatic disease (such as an infectious,endocrine, psychiatric, congenital, genetic, neurodegenerative or an oncologicalprocess).

Measures used

The 26-item SMILY©-Illness for children <19 years features parallel childself reports and parent reports with responses in the form of a five-step scalewith different facial expressions with 5th grade reading level. Thefour domains are similar to that of SMILEY and are: Effect on self (5 items),Limitations (8 items), Social (4 items) and Burden of Illness (7 items). Scoringis also similar to SMILEY, where each item score ranges from 1 to 5 and thetotal score is transformed to a 1 to 100 scale. Higher scores indicate betterHRQOL. If >12 questions are not answered, the SMILY©-Illness cannot bescored. The first two items on current illness status and HRQOL assessment arenot included in the domains or calculating the final score. The remainingquestions refer the respondent to the previous month.

Additional data

We examined self-esteem using the Piers Harris Self concept scale (SCS) [7, 8], entitled, “The Way I Feel About Myself.” Average scoresusually range from 46–60 with higher scores corresponding to betterself-concept. We collected data on demographics, ethnicity, co-morbidity,insurance, education; and impact of disease using the PedsQL-Family informationform. We recorded the date of disease onset, and the current/prior use of allmedication(s). The Hollingshead Socioeconomic scale (SES) score, which takesinto account the educational and occupational status of the family members, wascalculated using the educational and occupational status of the parents [9]. The scores range from 8 to 66, with higher scores indicating ahigher socioeconomic status [9].

Procedure

Appropriate Institutional Review Board approval was obtained at both sites.Potential subjects were identified at each center through the clinic appointmentschedule or during in-patient admissions. Children and parents completedcorresponding versions of the 26-item SMILY©-Illness and the SCS.The investigator was available at all times to respond to queries posed by studyrespondents.

Methods and statistical analysis

Using the SPSS statistical package for Windows (SPSS Inc, Chicago, Illinoisversions 20), we performed descriptive analyses on all variables and examineddata distribution, and examined instrument scores for ceiling and floor effects.Minimal missing data were handled in accordance with rules for scoring eachquestionnaire. Feasibility was determined from the percentage of missing valuesfor each item and the distribution of item responses [10]. Spearman’s rho correlation was used.

Results

Nineteen children (79% female, n=15) and 17 parents (16 mothers) participated in thestudy. The mean age was 12±4 years (3–18 years) with median diseaseduration of 21 months (1–172 months), and mean self -concept of 50±8(36–69). Hollingshead socioeconomic score was 47±11 (26–61).Subjects had the following diagnosis: SJIA (n=5, 26%), dermatomyositis (n=4, 21%),systemic sclerosis/CREST syndrome (n=5, 26%), mixed connective tissue disease (n=2,11%), Behçet’s disease (n=1, 5%), sarcoidosis (n=1, 5%), andSjögren’s syndrome (n=1, 5%). Seventeen patients used the Englishtranslation and two patients used the Spanish translation. They were of thefollowing ethnicities: White (n=9, 47%), Black (n=3, 16%), Mexican/Latino (n=6,32%), and Asian (n=1, 5%). The following had major life events (injury/illness-2,change of job-1, unable to pay bills-1, >/=2 events −4). Six children werein preschool-5th grade, 11 from 6th grade–11th grade and 1 was in college. They had the followinginsurance to cover their standard clinical care: private (n=12, 63%), Medicaid (n=5,26%), and other (n=1). The subjects were either currently using the followingmedications or discontinued them: corticosteroids (14/19, 74%), mycophoenolatemofetil (2/19, 11%), cyclosporine (5/19, 26%), cyclophosphamide and/or rituximab(3/19, 16%), hydroxychloroquine (9/19, 47%), azathioprine (1/19), methotrexate(4/19, 21%), and thalidomide (1/19).

Seventeen parents stated that their child had a health condition. Fourteen patientshad an emergency room/urgent care visit in the last year. Parents reported a mean of2.5 ±4, median 2.5 missed work-days in the past 30 days. Parents perceived theimpact of child’s illness on daily routine at work (sometimes, often or almostalways) in 10/14 cases, and ability to concentrate at work (sometimes, often oralmost always) in 12/14 cases). The conditions (other than rheumatic diseases)mentioned by the subjects were: neurocardiogenic syncope (n=1), and celiac disease(n=1).

Child and parent SMILY scores were highly correlated (Spearman rho 0.7, p <0.05,n=17). Child SMILY score correlated with duration illness (Spearman rho =0.4, NS).We examined the HRQOL scores of patients who had ever used disease modifyinganti-rheumatic drugs (DMARDS) versus those had never used DMARDS. The mean SMILYscores were 71± 49 (child, n=15) and 66± 15 (parent, n=12) forthose had had ever used DMARDS. The mean SMILY scores were 49± 13 (child,n=2) and 53± 20 (parent) for those had had ever used DMARDS.

Feasibility

17 child and 15 parent subjects completed the corresponding reports of SMILY©-illness. Subjects completed SMILY©-Illness in ≤10 minutes and scoring each questionnaire took ≤ 10 minutes. For the child report of SMILY©-Illness, 5 items were omitted out of a total of 442 items (26 items × 17 children) with mean number of items omitted =0.3±0.7 (range 0–2). Two children did not complete any forms. For the parent report of SMILY©-Illness, 19 items were omitted out of a total of 390 items (26 items × 15 parents who completed the scale). Mean number of items omitted =1.3±2.4 (range 0–8). Maximum number omitted was 8 items by one parent.

Means, standard deviations and response range of SMILY©-Illness andother questionnaires

Scores and distribution of SMILY©-Illness, are provided in Table 1. All the reviewers of SMILY©-Illness approved thecontent, found it to be valid and relevant, easy to understand and especiallyliked the responses in the form of faces. The questionnaire has face and contentvalidity (Table 2). Due to small sample size we didnot perform calculation for psychometric properties.
Table 1

Scale descriptives for child and parent reports of measures ofSMILY-Illness

Questionnaire

Child report

Parent report

SMILY©- illness total

69 ± 17 (40–100) (17)

64 ± 16 (40–100) (15)

Effect on self

68 ± 19 (40–100) (17)

64 ± 16 (40–100) (15)

Limitations

67 ± 17 (40–100) (17)

60 ± 17 (40–100) (15)

Social

81 ± 21 (35–100) (17)

77 ± 21 (40–100) (14)

Burden of illness

64 ± 20 (31–100) (17)

61 ± 18 (30–100) (15)

Global HRQOL

80 ± 22 (40–100) (17)

70 ± 20 (40–100) (14)

Global illness status

71 ± 25 (40–100) (17)

70 ± 22 (40–100) (35)

Mean ± SD (range) (number of subjects) is listedabove for child and parent reports. SMILY©-Illness scores rangebetween 0–100; Abbreviations used: Simple Measure ofImpact of Illness in Youngsters©-illness (SMILY©-Illness);SD (standard deviation).

Table 2

Translation and adaptation for cultural suitability of US EnglishSMILY-Illness

 

Language SMILY © was adapted into

Modified by professional translation company andcollaborators who made more edits

Number of reviewers for accuracy and cultural suitabilityand have finally approved the translation

1

Afrikans

Prof trans (1 Peds Rheum)

1Prof trans (1 Peds Rheum)

2

Arabic-Egypt

Prof trans, 3 Peds Rheum

3 (3 Peds Rheum)

3

Arabic-Saudi Arabia

Prof trans, 1 Peds Rheum

1 (1 Peds Rheum)

4

Czech

Prof trans, 1 Peds Rheum

2 (2 Peds Rheum.)

5

Danish

Prof trans, 2 Peds Rheum

2 (2 Peds Rheum.)

6

Dutch

Prof trans

1 (1 Peds Rheum)

7

English-United Kingdom

Adaptation by Peds Nephrologist

1 (Peds Nephrologist)

8

French

Prof trans, 1 Peds Rheum

2 (2 Peds Rheum)

9

German-Austria

Prof trans

2 (2 Peds Rheum)

10

German-Germany

Prof trans 1 Peds Rheum

2 (2 Peds Rheum)

11

German-Swiss

Prof Trans 1 Peds Rheum

2 (2 Peds Rheum)

12

Greek

Prof trans, 1 Peds Rheum

2 (2 Peds Rheum)

13

Hebrew

Prof trans

1 (Peds Rheum)

14

Hindi

Prof trans,

1 (1 Peds Rheum)

15

Hungarian

Prof trans,

1 (1 Peds Rheum)

16

Italian

Prof trans, 1 Peds Rheum

8 (8 Peds Rheum)

17

Japanese

Prof trans,

2 (2 Peds Rheum)

18

Portuguese

Prof trans 6 Peds Rheum

10 (10 Peds Rheum)

19

Romanian

Prof trans, 1 peds Rheum

1 (1 Peds Rheum)

20

Serbia

Prof trans, 1 Peds Rheum

1 (1 Peds Rheum)

21

Slovenia

Prof trans,

1 (1 Peds Rheum)

22

Spanish-Argentina

Prof trans, 1 Peds Rheum

2 (1 Peds Rheum)*

23

Spanish-Mexican

Prof trans, 2 Peds Rheum

2 (2 Peds Rheum)

24

Spanish-Spain

Prof trans, 2 Peds Rheum

2 (2 Peds Rheum)

25

Spanish –US& Puertorico

Prof trans

3 (3 Peds Rheum)*

26

Spanish-Venezuela

Prof trans, 2 Peds Rheum

2 (1 Adult Rheum, 1 Peds Rheum)

27

Turkish

Prof trans, 1 Peds Rheum

3 (3 Peds Rheum)

28

Xhosa

Prof Trans, 1 Peds Rheum nurse

2 (1 Prof trans, 1 Peds Rheum nurse)

*A physician of Argentinian origin, now living in USA, was involvedin both versions.

Abbreviations used: Prof trans-Professionaltranslation company. AP- Assistant Professor of PediatricRheumatology, Peds- Pediatrician, Peds Rheum- PediatricRheumatologist.

The enclosed translations are in the same order as above.

Translation process

We had already described the rigorous translation process of SMILEY in previousmanuscripts [5, 6]. All the SMILEY translations were adapted toSMILY©-Illness using a professional translation company.Collaborative relationships with the different centers across the world werealready set up. The review process was similar to the process we followed forSMILEY translations [5, 6]. From each country, pediatric rheumatologists reviewed thetranslation and approved them for content and cultural appropriateness for theirpopulation. Table 2 details the entire adaptationprocess of 28 languages and all the translations are enclosed at the end of thisbrief report as Additional file 1.

Conclusion

SMILY©-Illness is a brief, easy to administer and score HRQOL scale for childrenwith systemic rheumatic diseases. SMILY©-Illness is suitable for use acrossdifferent age groups and literacy levels. SMILY©-Illness has good faceand content validity based on its process of adaptation, review by multiplepediatric rheumatologists and initial testing. However, further validation in eachcountry is required for the translated and adapted versions. In our population, asignificant percentage of children were on immunosuppressive/immunomodulatorymedications. Parents appeared to feel the impact of their child’s illness on adaily basis. The children’s self-concept was only average. The mean totalSMILY illness scores were similar in the range of what we found for SMILEY scores inpatients with SLE [2]. The lowest scores were found in the domain of “burden ofillness” and the highest score indicating better HRQOL was found in the socialdomain as reported in other studies [2]. As found in the literature, children had higher scores compared toparents [2].

The number of subjects is very small and it would be ideal if the disease types werewell distributed. Unfortunately in this sample they are not due to referral bias atthe time of the study. Due to the small sample size, we cannot make any definitiveconclusions regarding the correlations. Another limitation is that we do not haveinformation regarding the duration of disease prior to diagnosis.

The availability of translations will make recruitment for validation easier sincethese diseases are rare. SMILY©-Illness with its available translations may beused as useful adjuncts to clinical practice and research, providing valuableinsight to the impact of disease on the overall HRQOL of the child.

Endnote

aRobert Wood Johnson Medical School, New Brunswick, NJ; and Hospital forSpecial Surgery, New York, NY.

Declarations

Authors’ Affiliations

(1)
Robert Wood Johnson Medical School, Rutgers University
(2)
Pediatric Rheumatology, Rutgers University Child Health Institute of NewJersey
(3)
Hospital for Special Surgery
(4)
University of Michigan
(5)
Pediatric Rheumatology, Red Cross War Memorial Children’s Hospital
(6)
Pediatric Allergy, Immunology and Rheumatology Unit, Ain Shams University
(7)
Pediatric Rheumatology, Pediatric Allergy, Immunology and Rheumatology Unit,Ain Shams University
(8)
King Faisal Specialist Hospital and Research Center
(9)
Charles University in Prague and General University Hospital
(10)
Pediatric Department, University Hospital Motol
(11)
Pediatric Rheumatology, Aarhus University Hospital
(12)
Pediatric Rheumatology, Juliane Marie Centret Rigshospitalet
(13)
Department of Pediatric Immunology, University Medical Center
(14)
Pediatric Rheumatology, Wilhelmina Children’s Hospital
(15)
Consultant Pediatric Nephrologist, Renal Unit, Great Ormond Street Hospital for Children NHS Foundation Trust
(16)
Pediatric Nephrology, Rheumatology and Dermatology Department, Hospices Civils de Lyon, Lyon University
(17)
Medical University of Innsbruck
(18)
Pediatric Rheumatology
(19)
Head of the Hamburg Centre for Pediatric and Adolescence Rheumatology
(20)
Pediatric Rheumatology, Asklepios Clinic Sankt
(21)
Pediatric Rheumatology, Zurich University Children’s Hospital
(22)
Pediatrics/Pediatric Rheumatology, Pediatric Immunology and RheumatologyReferral Center, Aristotle University
(23)
Kfar-Saba, Pediatric Rheumatology, Israel Meir Hospital
(24)
Pediatric Rheumatology, Sanjay Gandhi Postgraduate Institute of Medical Sciences
(25)
Pediatric Rheumatology, Semmelweis University
(26)
Pediatric Rheumatology, Anna Meyer Hospital
(27)
Pediatric Rheumatology, Research Center of Systemic Autoimmune and Autoinflammatory Diseases, University of Siena
(28)
Pediatric Rheumatology, University of Florence
(29)
Pediatric Rheumatology Unit, IRCCS Ospedale Pediatrico Bambino Gesù
(30)
Pediatric Rheumatology, University of Genoa Pediatria II-Reumatologia,Istituto G. Gaslini EULAR Centre of Excellence in Rheumatology
(31)
Pediatric Rheumatology, Institute of Pediatrics Università CattolicaSacro Cuore
(32)
Pediatric Rheumatology Unit, Department of Pediatrics, University of Padua
(33)
Yokohama City University School of Medicine
(34)
Pediatric Rheumatology, Universidade Estadual Paulista (UNESP)
(35)
Pediatric Rheumatology Unit, Department of Pediatrics, Universidade Federal de Sao Paulo
(36)
Rheumatology unit, Department of Medicine, State University of Campinas
(37)
Department of Pediatrics, Pediatric Rheumatology, Universidade Federal do Riode Janeiro
(38)
Department of Pediatrics, Universidade Federal do Rio de Janeiro
(39)
Pediatric Rheumatology Division, Adolescent Health Care Unit, Universidade doEstado do
(40)
Department of Pediatrics, Pediatric Rheumatology Unit, Children’sInstitute, Faculdade de Medicina da Universidade de Sao Paulo
(41)
Pediatric Rheumatology Unit, Children’s Institute, Sao Paulo
(42)
Pediatric Rheumatology, Clinica Pediatrie I
(43)
Pediatric Rheumatology, Institute of Rheumatology
(44)
Allergy, Rheumatology and Clinical Immunology, University Children’s Hospital, University Medical Center Ljubljana
(45)
Pediatric Rheumatology, Head Rheumatology Hospital Pedro de Elizalde
(46)
Pediatric Rheumatology, Hospital General de México
(47)
Hospital Infantil de México Federico Gómez
(48)
Pediatric Rheumatology, Hospital Sant Joan de Déu
(49)
Pediatric Rheumatology, Hospital Universitario Valle de Hebron
(50)
Pediatric Rheumatology
(51)
Pediatric Rheumatology
(52)
Pediatric Rheumatology, Mt Sinai Medical Center
(53)
Rheumatology, Mount Sinai Medical Center
(54)
Pediatric Rheumatology, Complejo Hospitalario Universitario Ruiz y Paez, Unidad de Reumatologia
(55)
Pediatric Rheumatology, Hacettepe University Department of Pediatrics
(56)
Pediatric Rheumatology, Cerrahpasa Medical School, Istanbul University
(57)
FMF Arthritis Vasculitis and Orphan disease Research Center, Institute ofHealth Sciences
(58)
Department of Pediatrics, Alberta Children’s Hospital Research Institute Faculty of Medicine, University of Calgary

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Copyright

© Moorthy et al.; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative CommonsAttribution License (http://creativecommons.org/licenses/by/4.0), whichpermits unrestricted use, distribution, and reproduction in any medium, provided theoriginal work is properly credited. The Creative Commons Public Domain Dedicationwaiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to thedata made available in this article, unless otherwise stated.

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