1. Department of Public Health Sciences, Division of Health Policy and Management, University of California, Davis School of Medicine, Sacramento, CA, USA
2. Department of Biostatistics and Epidemiology, Hudson College of Public Health, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
3. Department of Internal Medicine, Division of Hematology and Oncology, University of California, Davis School of Medicine, Sacramento, CA, USA
4. Stephenson Cancer Center, College of Medicine, Department of Family and Preventive Medicine, University of Oklahoma College of Health Science Center, Oklahoma City, OK, USA