1. Department of Health Policy and Management, School of Public Health, Texas A&M University, College Station, Texas, USA.
2. School of Nursing, Texas A&M University, College Station, Texas, USA.
3. Department of Epidemiology and Biostatistics, School of Public Health, Texas A&M University, College Station, Texas, USA.
4. School of Medicine, Texas A&M University, College Station, Texas, USA.