Sexually Transmitted Diseases, Viral

• Pfizer Investigational Site — Birmingham, Alabama, United States
• Pfizer Investigational Site — Boston, Massachusetts, United States
• Pfizer Investigational Site — Cologne, Germany
• Pfizer Investigational Site — Frankfurt, Germany

• Univ of Southern California — Los Angeles, California, United States
• Univ of California, San Diego Antiviral Research Ctr — San Diego, California, United States
• Univ of California San Francisco — San Francisco, California, United States
• San Mateo County AIDS Program — Stanford, California, United States

• GSK Investigational Site — Austin, Texas, United States

• GSK Investigational Site — Phoenix, Arizona, United States
• GSK Investigational Site — Little Rock, Arkansas, United States
• GSK Investigational Site — Beverly Hills, California, United States
• GSK Investigational Site — Fountain Valley, California, United States

• GSK Investigational Site — Baltimore, Maryland, United States

• St Stephen's Centre — London, United Kingdom

• Côte de Nacre University hospital — Caen, France

Not specified

• University of Texas Houston School of Public Health — Houston, Texas, United States

• Practice Hintsche — Berlin, Germany
• Practice Bieniek — Berlin, Germany
• Practice Dupke/Carganico/Baumgarten — Berlin, Germany
• Practice Schranz — Berlin, Germany