1. Institute of Neuroscience and Physiology, Section of Psychiatry and Neurochemistry (Najar, Joas, Pålsson, Landén) and Institute of Medicine, School of Public Health and Community Medicine (Jonsson), Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm (Landén).