[1] Univ Bonn, Inst Human Genet, D-53111 Bonn, Germany
[2] Univ Bonn, Inst Med Biometry Informat & Epidemiol, D-53111 Bonn, Germany
[3] Univ Bonn, Life & Brain Ctr, D-53111 Bonn, Germany
[4] GSF, Inst Epidemiol, Neuherberg, Germany
[5] Cent Inst Mental Hlth, Div Genet Epidemiol Psychiat, D-6800 Mannheim, Germany