1. From the South West Thames Renal and Transplantation Unit, Epsom and St. Helier Hospital, London, United Kingdom (R.J.S.); and Centre for Environmental and Preventive Medicine, Wolfson Institute of Preventive Medicine, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom (F.J.H., N.D.M., G.A.M.G.).