1. Division of Digestive Diseases; University of Cincinnati College of Medicine; Cincinnati Ohio
2. Departments of Psychiatry and Environmental Health; University of Cincinnati College of Medicine; Cincinnati Ohio
3. Miriam Hospital and Department of Medicine; Brown University; Providence Rhode Island
4. Beth Israel Deaconess Medical Center and the Fenway Institute; Boston Massachusetts
5. Hudson Infectious Diseases Associates; Briarcliff Manor New York
6. Department of Epidemiology; Johns Hopkins Bloomberg School of Public Health; Baltimore Maryland
7. Division of Infectious Diseases; School of Medicine; Wayne State University; Detroit Michigan
8. Division of Reproductive Health; Centers for Disease Control and Prevention; Atlanta Georgia