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Singapore
Condoms
Prostitution
Sexual Behavior
Questionnaires
Safe Sex
Heterosexuality
Health Knowledge, Attitudes, Practice
Sexually Transmitted Diseases
Gonorrhea
Pharyngeal Diseases
HIV Infections
Seborrheic Dermatitis
Cross-Sectional Studies
Health Promotion
Logistic Models
Incidence
Prospective Studies
Risk Factors
Sexual Partners
Co-Publications
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