[1] Center for Health Systems Research,Department of Medicine, School of Medicine
[2] Denver Health and Hospital Authority,Denver Public Health Department
[3] University of Colorado,Department of Epidemiology, School of Public Health
[4] Denver Health and Hospital Authority,Division of HIV/AIDS Prevention
[5] University of Colorado,Department of Community and Behavioral Health, Colorado School of Public Health
[6] Centers for Disease Control and Prevention,Department of Health and Behavioral Sciences, College of Liberal Arts and Sciences
[7] University of Colorado,undefined
[8] University of Colorado Denver,undefined