1. Parker Research Institute, Parker University, Dallas, Texas.
2. Department of Biostatistics & Epidemiology, School of Public Health, University of North Texas Health Science Center, Fort Worth, Texas.
3. Department of Community Health, Faculty of Clinical Sciences, University of Uyo, Uyo, Nigeria.
4. Department of Epidemiology, University of Arkansas for Medical Sciences, Little Rock, Arkansas.
5. Department of Public Health, National Liver Institute, Menoufiya University, Menoufiya, Egypt.