[1] New York Univ, Dept Pediat, Grossman Sch Med, New York, NY 10016 USA
[2] New York Univ, Dept Populat Hlth, Grossman Sch Med, New York, NY 10016 USA
[3] Natl Univ Singapore, Inst Human Dev & Potential ASTAR, Singapore City, Singapore
[4] Natl Univ Singapore, Yong Loo Lin Sch Med, Dept Paediat, Singapore City, Singapore
[5] Univ Queensland, Australian Women & GirlsHealth Res Ctr, Sch Publ Hlth, Herston, Qld, Australia
[6] Univ Utah, Dept Family & Prevent Med, Salt Lake City, UT USA