1. College of Public Health; University of Oklahoma Health Sciences Center; Oklahoma City OK USA
2. Division of Health Systems Management and Policy; The University of Memphis, School of Public Health; Memphis TN USA
3. Department of Health Promotion and Community Health Sciences; Texas A&M Health Science Center, School of Rural Public Health; College Station TX USA
4. Department of Epidemiology; University of California Irvine; Irvine CA USA
5. Department of Medicine; Stanford University; Stanford CA USA