作者单位:Univ Georgia, Ctr Family Res, Athens, GA 30602 USA[1]Iowa State Univ, Dept Psychol, Ames, IA 50011 USA[2]Yeshiva Univ, Albert Einstein Coll Med, Dept Epidemiol & Populat Hlth, New York, NY 10033 USA[3]Univ Georgia, Dept Child & Family Dev, Athens, GA 30602 USA[4]