1. Division of General Internal Medicine, Department of Medicine, University of California, Los Angeles , California , USA
2. Division of Infectious Diseases, Department of Medicine, University of California, Los Angeles , California , USA
3. Department of Pharmaceutical Services, University of California, Los Angeles , California , USA
4. Division of Infectious Diseases, Department of Medicine, Stanford University , Palo Alto, California , USA
5. Division of Infectious Diseases, Department of Pediatrics, University of California, Los Angeles , California , USA
6. Division of Infectious Diseases, Department of Medicine, Johns Hopkins University School of Medicine , Baltimore, Maryland , USA