1. Research Department, American College of Obstetricians and Gynecologists, 409 12th Street, SW, Washington, DC 20024, USA
2. Department of Psychology, American University, 4400 Massachusetts Avenue, NW, Washington, DC 20016, USA
3. Department of Obstetrics and Gynecology, Wayne State University School of Medicine, 6071 W. Outer Drive, Detroit, MI 48235, USA