1. Medical Nutrition, Department of Medical Sciences, College of Allied Health Professions, University of Nebraska Medical Center, Omaha, NE 68198, USA
2. College of Nursing, Creighton University, Omaha, NE 68178, USA
3. Department of Biostatistics, College of Public Health, University of Nebraska Medical Center, Omaha, NE 68198, USA
4. Department of Epidemiology and Biostatistics and Cancer Prevention and Control Program, University of South Carolina, Columbia, SC 29208, USA
5. Division of Diabetes, Endocrine & Metabolism, Department of Internal Medicine, College of Medicine, University of Nebraska Medicine, Omaha, NE 68198, USA