作者单位:Univ Iowa, Dept Epidemiol, Coll Publ Hlth, Iowa City, IA 52242 USA[1]Fred Hutchinson Canc Res Ctr, Div Publ Hlth Sci, 1100 Fairview Ave N, Seattle, WA 98109 USA[2]Univ Hawaii, John A Burns Sch Med, Dept Geriatr Med, Honolulu, HI 96822 USA[3]Univ Massachusetts, Sch Med, Div Prevent & Behav Med, Worcester, MA 01605 USA[4]Univ Calif San Diego, Dept Family & Prevent Med, La Jolla, CA 92093 USA[5]