Unwelcome Guests With Master Keys: How HIV Enters Cells and How It Can Be Stopped; HIV and Sexually Transmitted Diseases: Lethal Synergy; Secrets and Safety in the Age of AIDS: Does HIV Disclosure Lead to Safer Sex?; Update of the Drug Resistance Mutations in HIV-1: 2004; Antiretroviral Treatment for Adult HIV Infection in 2004: Updated Recommendations of the International AIDS Society–USA Panel