[1] Cincinnati Childrens Hosp Med Ctr, Div Biostat & Epidemiol, Cincinnati, OH 45229 USA
[2] Ohio State Univ, Sch Med, Columbus, OH 43210 USA
[3] Harvard Univ, Sch Med, Cambridge, MA 02138 USA
[4] Hosp Enr Aguilar Cerrato, La Esperanza, Honduras
[5] Univ Cincinnati, Coll Med, Dept Pediat, Cincinnati, OH 45220 USA
[6] Cincinnati Childrens Hosp Med Ctr, Perinatal Inst, Cincinnati, OH 45229 USA
[7] Cincinnati Childrens Hosp Med Ctr, Global Hlth Ctr, Cincinnati, OH 45229 USA