1. Department of Internal Medicine, College of Medicine, University of Arkansas for Medical Sciences Northwest, Fayetteville, AR, USA
2. Department of Epidemiology, Fay W. Boozman College of Public Health, University of Arkansas for Medical Sciences, Little Rock, AR, USA
3. Department of Biostatistics, Fay W. Boozman College of Public Health, University of Arkansas for Medical Sciences, Little Rock, AR, USA
4. Department of Surgery, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, USA
5. Division of Medical Genetics, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, USA