Syphilis associated with recreational drug use, depression and high-risk sexual behaviour in men who have sex with men: a case–control study in China
Huichao Wu, Cuizhen Xiu, Xiaojing Fu, Menglong Li, Zhenhong Wang, Xiufang Li, Jing Wu, Sten H Vermund, Yifei Hu
Sexually Transmitted Infections Jun 2019, 95 (4) 267-272; DOI: 10.1136/sextrans-2018-053878