[1] Univ Michigan, Ctr Human Growth & Dev, 300 N Ingalls, Ann Arbor, MI 48109 USA
[2] Texas Tech Univ, Human Dev & Family Studies, Lubbock, TX 79409 USA
[3] Univ Toronto, Dept Psychol, Toronto, ON, Canada
[4] Res Ctr Grp Dynam, Ann Arbor, MI USA
[5] Ctr Human Growth & Dev, Ann Arbor, MI USA
[6] Biosocial Methods Collaborat, Ann Arbor, MI USA
[7] Univ Michigan, Psychol, 300 N Ingalls, Ann Arbor, MI 48109 USA
[8] Family Transit Study, Ann Arbor, MI USA
[9] Univ Georgia, Ctr Family Res, Athens, GA 30602 USA