1. Department of Obstetrics and Gynecology; Mount Auburn Hospital; Harvard Medical School affiliate; Cambridge MA USA
2. Beth Israel Deaconess Medical Center; Harvard Medical School affiliate; Boston MA USA
3. Department of Obstetrics and Gynecology; Columbia University Medical Center; New York NY USA
4. Department of Obstetrics and Gynecology; Brown University; Providence RI USA
5. Harvard Medical School; Boston MA USA
6. Touro College of Osteopathic Medicine; New York NY USA