1. Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital, Harvard Medical School , Boston, Massachusetts , USA
2. Department of Medicine, Division of Infectious Disease, Brigham and Women's Hospital, Harvard Medical School , Boston, Massachusetts , USA
3. Department of Obstetrics and Gynecology, Massachusetts General Hospital, Harvard Medical School , Boston, Massachusetts , USA
4. Department of Obstetrics and Gynecology, University of Washington School of Medicine , Seattle, Washington , USA
5. Vincent Center for Reproductive Biology, Massachusetts General Hospital , Boston, Massachusetts , USA
6. Department of Obstetrics and Gynecology, Brigham and Women's Hospital, Harvard Medical School , Boston, Massachusetts , USA