Figure 1From: Predictors of HIV infection and prevalence for syphilis infection among injection drug users in China: Community-based surveys along major drug trafficking routesLocation of study sites. This study was conducted in three sites along major drug (heroin) trafficking routes in Yili Prefecture, Xinjiang Uygar Autonomous Region (A); Honghe Autonomous Prefecture, Yunnan Province (B), and Nanning City, Guangxi Zhuang Autonomous Region (C).Back to article page