1. Department of Obstetrics/Gynecology; University of Massachusetts Medical School/UMass Memorial Health Care; Worcester MA USA
2. Department of Quantitative Health Sciences; Division of Epidemiology of Chronic Diseases and Vulnerable Populations Worcester; University of Massachusetts Medical School; Worcester MA USA
3. Obstetrics/Gynecology Residency Program; New York University Langone Medical Center; New York NY USA
4. Sanofi; Beijing China
5. Department of Medicine; Division of Preventative and Behavioral Medicine; University of Massachusetts Medical School; Worcester MA USA
6. Pharmacoepidemiology and Global Maternal-Child Health Research; Epidemiology and Biostatistics (Affiliate) of University of South Florida; St. Petersburg FL USA
7. Maternity Services Cambridge Health Alliance; Cambridge MA USA