Risk Factors for HIV sero-conversion in a high incidence cohort of men who have sex with men and transgender women in Bangkok, Thailand oleh Tanyaporn Wansom, Sant Muangnoicharoen, Sorachai Nitayaphan, Suchai Kitsiripornchai, Trevor A. Crowell, Leilani Francisco, Paileen Gilbert, Dixion Rwakasyaguri, Jittima Dhitavat, Qun Li, David King, Merlin L. Robb, Kirsten Smith, Elizabeth A. Heger, Siriwat Akapirat, Punnee Pitisuttithum, Robert J. O'Connell, Sandhya Vasan