1. From the Department of Medicine (K.M., T.N.W.) and Nutrition Research Section (G.F.), Imperial College London, and the Medical Research Council Clinical Trials Unit at University College London (E.C.G., D.M.G., A.S.W.), London, the School of Medicine, Dentistry, and Biomedical Science, Queen’s University, Belfast (N.K.), the Liverpool School of Tropical Medicine and Hygiene, Liverpool (I.B.), the Department of Pediatrics, University Hospital of Wales, Cardiff (J.A.E.), and the Centre for Health Economics...