Estudio (2) Distrito do Porto (1) Non-governmental organizations (1) Worry (1) Syphilis (1) Stress (Psychology) (1) Sex (1) Quality of products (1) Psychology (1) Proportion (1) Population (1) Policy sciences (1) Infection (1) History (1) Hepatitis (1) Health (1) Gay liberation movement (1) Diagnosis (1) Human rights (1) Attention (1) AIDS (Disease) (1) Actors (1) Movimientos de liberación de los homosexuales (1) Organizaciones no gubernamentales (1) Salud (1) Hepatitis (1) Sífilis (1) Calidad (1) Atención (1) Estrés (Psicología) (1)