1. Division of Infectious Diseases, Harbor-UCLA Medical Center, Torrance and UCLA AIDS Institute Center for AIDS Research, Los Angeles, California, USA
2. School of Medicine, University of California, Los Angeles
3. RAND, Santa Monica; alth Services, University of California, Los Angeles, USA
4. UCLA AIDS Institute Center for AIDS Research, Los Angeles; RAND, Santa Monica; Dept of Health Services, University of California, Los
Angeles and Division of General Internal Medicine and Health Services Research, University of California, Los Angeles, California, USA