646Using Real World Data to Assess the Risk of Suicidality among Patients Initiating an Efavirenz-containing Regimen versus an Efavirenz-free Antiretroviral Regimen. (December 2014) - Nkhoma, Ella; Coumbis, John; Farr, Amanda; Johnston, Stephen; Chu, Bong-Chul; Rosenblatt, Lisa; Seekins, Daniel W.; Villasis, Angelina