1. Institute of Neuroscience and Physiology, Neuropsychiatric Epidemiology, Sahlgrenska Academy, University of Gothenburg, Wallinsgatan 6, SE-431 41 Mölndal, Sweden
2. Sahlgrenska Academy, Center for Ageing and Health—AGECAP, Gothenburg University, Wallinsgatan 6, SE-431 41 Mölndal, Sweden
3. Health Services and Population Research Department, Psychology and Neuroscience, Centre for Global Mental Health, Institute of Psychiatry, King's College London, Strand, London WC2R2LS, UK