1. Sexually Transmitted Disease Control Branch, California Department of Public Health, Richmond, CA, USA
2. Public Health Unit, California Prison Health Care Services, Sacramento, CA, USA
3. Division of STD Prevention, National Center for HIV/AIDS, Viral Hepatitis, STD and TB Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA
4. Sexually Transmitted Disease Control Branch, California Department of Public Health, Bakersfield, CA, USA