1. Division of Infectious Diseases, Department of Medicine , Emory University School of Medicine , 49 Jesse Hill Jr. Drive , Atlanta, GA 30303 , USA
2. Department of Medicine, David Geffen School of Medicine , University of California Los Angeles , Los Angeles, CA , USA
3. Department of Medicine Statistics Core , University of California Los Angeles , Los Angeles, CA , USA
4. Infectious Diseases Section, VA Greater Los Angeles Healthcare System , Los Angeles, CA , USA
5. Hospitalist Division of the Department of Medicine, VA Greater Los Angeles Healthcare System , Los Angeles, CA , USA