Trends in unprotected intercourse among heterosexual men before and after brothel ban in Siem Reap, Cambodia: a serial cross-sectional study (2003–2012) oleh Mee Lian Wong, Alvin Kuo Jing Teo, Bee Choo Tai, Alwyn Mao Tong Ng, Raymond Boon Tar Lim, Dede Kam Tyng Tham, Nashwinder Kaur, Rayner Kay Jin Tan, Sarath Kros, Savun Touch, Maryan Chhit, Ian Lubek