1. From the Unit of Epidemiology & Population Genetics (P.R., A.S., G.B., F.L.), Institute of Food Sciences, CNR, Avellino, Italy; Clinical Science Research Institute (M.A.M., S.K., F.P.C.), University of Warwick Medical School, Coventry, UK; the Institute of Genetics and Biophysics “Adriano Buzzati-Traverso” (T.E., F.G.), CNR, Naples, Italy; and the Department of Clinical & Experimental Medicine (P.S.), University of Naples “Federico II”, Naples, Italy.