1. Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles , California , USA
2. Center for Biostatistics in AIDS Research, Harvard T.H. Chan School of Public Health , Boston, Massachusetts , USA
3. Department of Epidemiology, Harvard T.H. Chan School of Public Health , Boston, Massachusetts , USA
4. Department of Medicine, Northwestern University, Feinberg School of Medicine , Chicago, Illinois , USA
5. Department of Medicine, Duke University School of Medicine , Durham, North Carolina , USA
6. Department of Medicine, University of Texas Southwestern Medical Center , Dallas, Texas , USA
7. Department of Medicine, University of Alabama School of Medicine , Birmingham, Alabama , USA
8. Department of Medicine, Johns Hopkins University School of Medicine , Baltimore, Maryland , USA