[1] Univ Wurzburg, Childrens Hosp, Div Paediat Rheumatol, Wurzburg, Germany
[2] Univ Wurzburg, Childrens Hosp, Div Immunol, Wurzburg, Germany
[3] Univ Wurzburg, Childrens Hosp, Div Infect Dis, Wurzburg, Germany
[4] Univ Wurzburg, Childrens Hosp, Div Paediat Gastroenterol, Wurzburg, Germany
[5] Univ Marburg, Childrens Hosp, Div Paediat Rheumatol & Nephrol, Marburg, Germany
[6] Univ Wurzburg, Inst Radiodiagnost, Dept Pediat Radiol, Wurzburg, Germany
[7] Univ Wurzburg, Childrens Hosp, Div Paediat Gastroenterol, Wurzburg, Germany