1. Department of Medicine, University of California San Diego , San Diego, California , USA
2. Department of Biostatistics, Harvard T.H. Chan School of Public Health , Boston, Massachusetts , USA
3. Department of Medicine, Emory Vaccine Center, Emory University School of Medicine and Rollins School of Public Health , Atlanta, Georgia , USA
4. Department of Medicine, University of California San Francisco , San Francisco, California , USA
5. Department of Medicine, Case Western Reserve University , Cleveland, Ohio , USA