Clínica Especializada Condesa (IMAGE) Brown University Caption Brown University public health economist Omar Galárraga is studying sexual risk behaviors among male sex workers in Mexico City in hopes of finding a way to reduce the high rate of HIV transmission. Credit Omar Galárraga/Brown University Usage Restrictions with credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.