[1] Med Univ Vienna, Dept Internal Med 3, Vienna, Austria
[2] Heidelberg Univ, Heidelberg, Germany
[3] Wilhelmina Childrens Hosp Utrecht, Utrecht, Netherlands
[4] Semmelweis Univ, H-1085 Budapest, Hungary
[5] Univ Iuliu Hatieganu, Dept Pediat, Cluj Napoca, Romania
[6] Charles Univ Prague, Prague, Czech Republic
[7] Univ Innsbruck, A-6020 Innsbruck, Austria