[1] Gulhane Mil Med Fac, Ankara, Turkey
[2] Osped Gaslini, Genoa, Italy
[3] UCL, London, England
[4] Hop Necker Enfants Malad, Paris, France
[5] Hosp St Joan de Deu, Barcelona, Spain
[6] Kanuni Hosp, Istanbul, Turkey
[7] Hosp Sor Maria Ludov, Unidad Reumatol, La Plata, Buenos Aires, Argentina
[8] Univ Buenos Aires, Buenos Aires, DF, Argentina
[9] Jaslok Hosp & Res Ctr, Bombay, Maharashtra, India
[10] Univ Padua, Dept Pediat, Padua, Italy
[11] All India Inst Med Sci, Bombay, Maharashtra, India
[12] Hop Femme Mere Enfant, Lyon, France
[13] Sao Paulo Med Fac, Sao Paulo, Brazil
[14] King Faisal Specialist Hosp & Res Ctr, Riyadh, Saudi Arabia
[15] Inst Salud Nino Brena, Lima, Peru
[16] Univ Fed Rio de Janeiro, Rio De Janeiro, Brazil
[17] UNESP, Botucatu, SP, Brazil
[18] Univ Genoa, Osped Gaslini, Genoa, Italy
[19] Hacettepe Univ, Ankara, Turkey