1. Department of Medicine, Section of Infectious Diseases, Baylor College of Medicine, Houston, Texas, USA
2. Department of Medicine, Section of Health Services Research, Center for Innovations in Quality, Safety, and Effectiveness (IQuESt), Michael E. DeBakey VA Medical Center and Baylor College of Medicine, Houston, Texas, USA
3. Department of Epidemiology, University of Texas MD Anderson Cancer Center, Houston, Texas, USA
4. Department of General Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas, USA
5. School of Social Sciences, Rice University, Houston, Texas, USA