1 Virginia Tech Carilion School of Medicine, Virginia Polytechnic Institute and State University, Roanoke, Virginia.
2 Section of Gastroenterology, Department of Internal Medicine, Virginia Tech Carilion School of Medicine, Virginia Polytechnic Institute and State University, Roanoke, Virginia.
3 Virginia Tech Carilion School of Medicine, Virginia Polytechnic Institute and State University, Roanoke, Virginia; Section of Dermatology, Department of Internal Medicine, Virginia Tech Carilion School of Medicine, Virginia Polytechnic Institute and State University, Roanoke, Virginia; Department of Basic Science Education, Virginia Tech Carilion School of Medicine, Virginia Polytechnic Institute and State University, Roanoke, Virginia.