Affiliation: | 1. Clinical Research Unit, Canterbury District Health Board, Christchurch, New Zealand;2. Department of Psychological Medicine, University of Otago, Christchurch, New Zealand;3. Departments of Psychiatry and Nutrition, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina;4. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden |