Sexually Transmitted Diseases, Viral

• GSK Investigational Site — Guangzhou, Guangdong, China
• GSK Investigational Site — Shenyang, Liaoning, China
• GSK Investigational Site — Chengdu, Sichuan, China
• GSK Investigational Site — Hangzhou, Zhejiang, China

• GSK Investigational Site — Birmingham, Alabama, United States
• GSK Investigational Site — Bakersfield, California, United States
• GSK Investigational Site — Los Angeles, California, United States
• GSK Investigational Site — Los Angeles, California, United States

• Health Initiative for Men — Vancouver, British Columbia, Canada
• Regional HIV/AIDS Connection — London, Ontario, Canada
• Immunodeficiency Clinic - The Ottawa Hospital — Ottawa, Ontario, Canada
• Gay ZONE (Centretown Community Health Centre) — Ottawa, Ontario, Canada

• The Ottawa Hospital -General Campus — Ottawa, Ontario, Canada

• Chulalongkorn University Hospital — Bangkok, Thailand
• Thai Red Cross AIDS Research Centre — Bangkok, Thailand

• Peking Union Medical College Hospital — Beijing, China

Not specified

• University of California Davis — Sacramento, California, United States

• Virgen del Rocío University Hospital — Seville, Spain

• University of Alabama at Birmingham — Birmingham, Alabama, United States
• Spectrum Medical Group — Phoenix, Arizona, United States
• Kaiser Permanente - Los Angeles Medical Center — Los Angeles, California, United States
• University of Southern California AIDS Clinical Trials Group — Los Angeles, California, United States