Affiliation: | 1. Division of Nephrology, Nephrology Research and Training Center, Department of Medicine, University of Alabama at Birmingham, , Birmingham, Alabama, USA;2. Department of Veterans Affairs Medical Center, , Birmingham, Alabama, USA;3. Children's National Medical Center and School of Medicine and Health Sciences, George Washington University, , Washington, DC, USA;4. Division of Gastroenterology, Department of Medicine, University of Alabama at Birmingham, , Birmingham, Alabama, USA |