作者单位:Harvard Med Sch, Bartlett Hall Extens,Room 906,55 Fruit St, Boston, MA 02114 USA[1]Harvard TH Chan Sch Publ Hlth, Dept Nutr, Boston, MA USA[2]Univ Southern Calif, Sch Gerontol, Longev Inst, Dept Biol Sci, Los Angeles, CA 90089 USA[3]Massachusetts Gen Hosp, Div Gastroenterol, Clin & Translat Epidemiol Unit, Bartlett Hall Extens[4]