1. Department of Obstetrics and Gynecology, Unviersity of Massachusetts Medical School, Worcester, Massachusetts.
2. Department of Pediatrics, Unviersity of Massachusetts Medical School, Worcester, Massachusetts.
3. Department of Obstetrics and Gynecology, UMass Memorial Health Care, Worcester, Massachusetts.
4. Department of Quantitative Health Sciences, University of Massachusetts Medical School, Worcester, Massachusetts.
5. Department of Medicine, University of Massachusetts Medical School, Worcester, Massachusetts.