[1] Helios Ctr Pediat Surg, Berlin, Germany
[2] German Canc Res Ctr, Div Clin Epidemiol & Aging Res, Heidelberg, Germany
[3] Univ Med Ctr Regensburg, Dept Pediat Urol, Regensburg, Germany
[4] Klinikum Bremen Mitte, Ctr Child & Youth Hlth, Dept Pediat Surg & Urol, Bremen, Germany
[5] Johannes Gutenberg Univ Mainz, Sch Med, Dept Urol, Div Pediat Urol, Mainz, Germany
[6] Charite Univ Med Berlin, Dept Pediat Surg, Berlin, Germany
[7] Univ Bonn, Dept Pediat, Pediat Psychol, Bonn, Germany
[8] Johannes Gutenberg Univ Mainz, Dept Child & Adolescent Psychiat, Mainz, Germany
[9] Univ Bonn, Inst Human Genet, Bonn, Germany
[10] Univ Bonn, Childrens Hosp, Dept Neonatol, Bonn, Germany
[11] Univ Ulm, Dept Urol & Pediat Urol, D-89075 Ulm, Germany