1. Event-Specific Risk Factors Predicting Episodes of Unprotected Anal Intercourse with Male Nonregular Partners among Men Who Have Sex with Men Using Case-Crossover Study Design. (20th July 2014) Authors: Li, Jinghua; Lau, Joseph T. F.; Gu, Jing; Hao, Chun; Lai, Coco H. Y. Other Names: Martinez Esteban Academic Editor. Journal: BioMed research international Issue: Volume 2014(2014) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗