1. From the School of Social and Community Medicine, University of Bristol, Bristol, UK (R.M.M., R.P., Y.F., G.D.S.); Medical Research Council/University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, UK (R.M.M., G.D.S.); National Institute for Health Research, Bristol Biomedical Research Unit in Nutrition, Bristol, UK (R.M.M.); Departments of Pediatrics and of Epidemiology, Biostatistics, and Occupational Health, McGill University Faculty of Medicine, Montreal, Canada (M.S.K....