1. Department of Child and Adolescent Psychiatry and Psychotherapy (G.B., A.H., J.H.), University of Duisburg-Essen, 45147 Essen, Germany
2. Department of Internal Medicine and Cardiology (A.M.S., M.S., B.M., J.R.S.), 35037 Marburg, Germany
3. Institute of Medical Biometry and Epidemiology (F.G., H.S.), Philipps University, 35037 Marburg, Germany
4. deCODE Genetics (F.G.), 101 Reykjavik, Iceland