1. From the Department of Medical Epidemiology and Biostatistics and the Department of Clinical Neuroscience, Centre for Psychiatry Research, Karolinska Institutet, Stockholm; the Institute of Neuroscience and Physiology, The Sahlgrenska Academy at Gothenburg University, Gothenburg, Sweden; the Stanley Center for Psychiatric Research, Broad Institute of the Massachusetts Institute of Technology and Harvard University, Cambridge, Mass.; and the Department of Medical Sciences, Örebro University, Örebro, Sweden.