Predictors of unprotected sex among men who have sex with men in Beijing, China.
Li X, Shi W, Li D, Ruan Y, Jia Y, Vermund SH, Zhang X, Wang C, Liu Y, Yu M, Xing H, Hong K, Shao Y.
Li X, et al. Among authors: vermund sh.
Southeast Asian J Trop Med Public Health. 2008 Jan;39(1):99-108.
Southeast Asian J Trop Med Public Health. 2008.
PMID: 18567448
Free PMC article.