3Department of Epidemiology and Biostatistics, MRC–PHE Centre for Environment and Health, School of Public Health, Imperial College London, London W2 1PG, UK
6Biocenter Oulu, University of Oulu, Aapistie 5A, P.O. Box 5000, 90014 Oulu, Finland
8Center for Life-Course Health Research and Northern Finland Cohort Center, Faculty of Medicine, University of Oulu, P.O. Box 5000, 90014 Oulu, Finland
9Unit of Primary Care, Oulu University Hospital, Kajaanintie 50, 90029 OYS, P.O. Box 20, 90220 Oulu, Finland
