1. From the Clinical Research Unit (H.K.), London School of Hygiene & Tropical Medicine, London, United Kingdom; the Department of Medical Epidemiology and Biostatistics (H.-O.A., E.W.), Karolinska Institutet, Stockholm, Sweden; the Department of Epidemiology (H.-O.A.), Harvard University, Boston, Massachusetts; The Cancer Registry of Norway (T.T.), Oslo, Norway; and the Division of Psychosocial Factors & Health, Department of Public Health Sciences (E.W.), Karolinska Institutet, Stockholm,...