1. Cai, W., Feng, T., Tan, J., Chen, L., She, X., Chen, P., et al. (2005). A survey of the characteristics and STD/HIV infection of homosexuality in Shenzhen. Chinese Journal of Modern Preventive Medicine, 32, 328–330.
2. Castilla, J., Barrio, G., Belza, M. J., & de la Fuente, L. (1999). Drug and alcohol consumption and sexual risk behaviour among young adults: Results from a national survey. Drug and Alcohol Dependence, 56(1), 47–53. doi: 10.1016/S0376-8716(99)00008-3 .
3. Centers for Disease Control and Prevention. (2006). HIV prevalence among populations of men who have sex with men—Thailand, 2003 and 2005. Morbidity and Mortality Weekly Report, 55(31), 844–848.
4. Chen, X., Yin, Y., Liang, G., Gong, X., Li, H., Poumerol, G., et al. (2005). Sexually transmitted infections among female sex workers in Yunnan, China. AIDS Patient Care and STDs, 19(12), 853–860. doi: 10.1089/apc.2005.19.853 .
5. China Center for Disease Control and Prevention. (2007a). Annual report of STD in China, 2006. Beijing: China Center for Disease Control and Prevention.