infection (3) Control (3) Prevention (3) Sex (3) Men (3) Infection (3) time (2) therapy (2) test (2) risk (2) analysis (2) rate (2) Treatment (2) Chlamydia (2) Time (2) Therapeutics (2) Risk (2) Proportion (2) Human beings (2) Male homosexuality (2) Evaluation (2) Sexual minorities (2) Use (2) Analysis (2) Number (2) cohort (2) survey (1) stable (1) behaviour (1) risk reduction (1)