1. From the Department of Epidemiology and Public Health, University College London, London, United Kingdom (MK); the MRC Centre for Causal Analyses in Translational Epidemiology, Department of Social Medicine, University of Bristol, Bristol, United Kingdom (DAL and GDS); the Department of Psychology, University of Helsinki, Helsinki, Finland (ME, MJ, and LK-J); and the Departments of Medicine (JSAV