1. Center for Social Medicine and Sexually Transmitted Diseases; Department of Sociology; University of Alabama at Birmingham; Birmingham; Alabama
2. Department of Sociology; Wayne State University; Detroit; Michigan
3. Department of Clinical Neuroscience; School of Medicine & Health Sciences; University of North Dakota; Grand Forks; North Dakota
4. Department of Obstetrics & Gynecology; Wayne State University; Detroit; Michigan
5. Department of Community and Family Health; College of Public Health; University of South Florida; Tampa; Florida
6. Department of Obstetrics & Gynecology; Feinberg School of Medicine; Northwestern University; Chicago; Illinois
7. Department of Obstetrics & Gynecology; George Washington University; Washington; District of Columbia