D. R. Gustafson, PhD, K. Bäckman, MS, M. Waern, MD, PhD, S. Östling, MD, PhD, X. Guo, MD, PhD, P. Zandi, PhD, M. M. Mielke, PhD, C. Bengtsson and I. Skoog, MD, PhD From the Section for Psychiatry and Neurochemistry, Neuropsychiatric Epidemiology Unit (D.R.G., K.B., M.W., S.Ö., X.G., I.S.), and the Department of Primary Care (C.B.), Sahlgrenska Academy, University of Gothenburg, Sweden; the Departm