[1] Univ Southern Calif, Psychol, Los Angeles, CA USA
[2] Univ Michigan, Epidemiol, Ann Arbor, MI USA
[3] USC, Keck Sch Med, Mol Microbiol, Los Angeles, CA USA
[4] Univ Southern Calif, Ctr Econ & Social Res, Los Angeles, CA USA
[5] Jonkoping Univ, Inst Gerontol, Jonkoping, Sweden
[6] Univ Virginia, Psychol, Charlottesville, VA USA
[7] Univ Louisville, Sch Med, Norton Childrens Res Inst, Louisville, KY USA
[8] Univ Louisville, Sch Med, Pediat, Louisville, KY USA