Wang, C.-C., S.-L. Chang, F.-Y. Chu, C.-Y. Cheng, and S.-H. Cheng. “Human Papillomavirus Infection and Anal Cytology in Taiwanese Homosexual Men With and Without HIV Infection”. The Journal of Infection in Developing Countries, Vol. 13, no. 04, Apr. 2019, pp. 318-25, doi:10.3855/jidc.11162.