Anal human papillomavirus prevalence and risk factors among men who have sex with men in Vietnam oleh Le Anh Tuan, MD, PhD, Kiesha Prem, PhD, Quang Duy Pham, MD, PhD, Zheng Quan Toh, PhD, Hau Phuc Tran, MD, PhD, Phuc Duy Nguyen, MSc, Chu Thi Ngoc Mai, BSc, Le Thi Khanh Ly, BSc, Van Cao, PhD, Tam-Duong Le-Ha, PhD, Nguyen Anh Tuan, PhD, Mark Jit, PhD, Kathryn Bright, BN, Marc Brisson, PhD, Thuong Vu Nguyen, MD, PhD, Suzanne Garland, MD, PhD, Dang Duc Anh, PhD, Nguyen Van Trang, PhD, Kim Mulholland, MD, PhD