[1] Semmelweis Univ, Inst Behav Sci, Nagyvarad Ter 4, H-1089 Budapest, Hungary
[2] Heim Pal Childrens Hosp, Hematooncol Unit, Ulloi Ut 86, H-1089 Budapest, Hungary
[3] Univ Pecs, Dept Pediat, Jozsef Attila Utca 7, H-7623 Pecs, Hungary
[4] Semmelweis Univ, Dept Pediat 2, Tuzolto Utca 7-9, H-1094 Budapest, Hungary
[5] Borsod Abauj Zemplen Cty Cent Hosp, Velkey Laszlo Childs Hlth Ctr, Szentpeteri Kapu 72-76, H-3526 Miskolc, Hungary
[6] Univ Teaching Hosp, Szentpeteri Kapu 72-76, H-3526 Miskolc, Hungary