1. Department of Obstetrics, Gynecology and Reproductive Sciences, University of Vermont College of Medicine, Burlington, VT, USA
2. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA, USA
3. The Jackson Laboratory, Bar Harbor, ME, USA
4. Center for Biomedical Informatics, Warren Alpert Medical School of Brown University, Providence, RI, USA