[1] Univ S Florida, Coll Publ Hlth, Maternal & Child Hlth Comparat Effectiveness Res, Dept Epidemiol & Biostat, Tampa, FL 33612 USA
[2] Univ S Florida, Coll Med, Div Maternal Fetal Med, Dept Obstet & Gynecol, Tampa, FL 33612 USA
[3] Univ S Florida, Coll Publ Hlth, Dept Community & Family Hlth, Tampa, FL 33612 USA
[4] Univ S Florida, Coll Publ Hlth, Dept Hlth Policy & Management, Tampa, FL 33612 USA