temps (durée) (3) Time (3) Swiss (3) Manufacturers' agents (3) Impact (3) Commission merchants (3) Transmission (3) cohorte (3) risque (2) modèle (2) analyse (2) épidémie (2) Europe (2) Testing (2) Cases (2) Testing (2) Syphilis (2) Sex (2) Risk-taking (Psychology) (2) Risk (2) Population (2) Men (2) Example (2) Anal sex (2) Cases (2) Analysis (2) Syphilis (2) Population (2) Number (2) puits (1)