1. Tropical Metabolism Research Unit (M.S.B., M.T., F.I.B., T.E.F.), Tropical Medicine Research Institute, The University of the West Indies, Mona, Kingston 7, Jamaica;
2. Medical Research Council Environmental Epidemiology Unit (C.O.), University of Southampton, Southampton General Hospital, Southampton, United Kingdom SO16 6YD;
3. Department of Medicine (J.P.M.), King’s College School of Medicine and Dentistry, London, United Kingdom SE5 9PJ