1. Department of Health Policy & Management, UCLA Fielding School of Public Health, Los Angeles, California, USA
2. Division of Infectious Diseases, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois, USA
3. UCLA David Geffen School of Medicine, Los Angeles, California, USA
4. Department of Community Health Sciences, UCLA Fielding School of Public Health, Los Angeles, California, USA
5. Division of General Internal Medicine and Health Services Research, Department of Medicine, UCLA David Geffen School of Medicine, Los Angeles, California, USA