[1] Sophia Childrens Univ Hosp, Erasmus MC, Dept Paediat Paediat Rheumatol, NL-3000 CB Rotterdam, Netherlands
[2] Leiden Univ, Med Ctr, Dept Paediat Paediat Rheumatol, Leiden, Netherlands
[3] Emma Childrens Hosp AMC, Dept Paediat Paediat Rheumatol, Amsterdam, Netherlands
[4] Jan van Breemen Inst, Amsterdam, Netherlands
[5] Univ Groningen, Univ Med Ctr Groningen, Beatrix Childrens Hosp, Dept Paediat Paediat Rheumatol, Groningen, Netherlands
[6] Univ Nijmegen, Med Ctr Radboud, Dept Paediat Paediat Rheumatol, Nijmegen, Netherlands
[7] Maastricht Univ, Med Ctr, Dept Internal Med, Subdiv Rheumatol, Maastricht, Netherlands
[8] Hagaziekenhuis Juliana Childrens Hosp, Dept Paediat, The Hague, Netherlands
[9] Utrecht MC Wilhelmina Childrens Hosp, Dept Paediat Paediat Rheumatol, Utrecht, Netherlands