[1] Ankara Childrens Hematol & Oncol Training & Res, Dept Pediat, Ankara, Turkey
[2] Gazi Univ, Fac Med, Dept Med Educ, Ankara, Turkey
[3] Gazi Univ, Fac Med, Dept Social Pediat, Ankara, Turkey
[4] Univ Iowa, Dept Pediat, Childrens Hosp, Iowa City, IA 52242 USA