[1] Univ Kentucky, Coll Publ Hlth, Lexington, KY 40506 USA
[2] Indiana Univ, Rural Ctr AIDS STD Prevent, Bloomington, IN USA
[3] Indiana Univ, Kinsey Inst Res Sex Gender & Reprod, Bloomington, IN USA
[4] Univ Southampton, Dept Psychol, Southampton SO9 5NH, Hants, England
[5] Univ Guelph, Dept Family Relat & Appl Nutr, Guelph, ON N1G 2W1, Canada
[6] Indiana Univ, Dept Gender Studies, Bloomington, IN USA
[7] Indiana Univ, Dept Appl Hlth Sci, Bloomington, IN 47405 USA
[8] Boston Childrens Hosp, Div Adolescent Young Adult Med, Boston, MA USA
[9] Harvard Univ, Sch Med, Dept Pediat, Boston, MA 02115 USA