1. Division of Gastroenterology, Hepatology & Nutrition; Department of Medicine; University of Iowa; Iowa City IA USA
2. Department of Internal Medicine; University of Louisville; Louisville KY USA
3. Division of Gastroenterology, Hepatology & Nutrition; Department of Medicine; University of Louisville; Louisville KY USA
4. Division of Neuromuscular Medicine; University of Mississippi; Oxford MS USA
5. GI Motility Clinic; Jewish Hospital; Louisville KY USA
6. Division of Medicine; University of Mississippi Medical Center; Jackson MS USA
7. Division of Gastroenterology, Hepatology & Nutrition; Department of Medicine; Jewish Hospital GI Motility Clinic; University of Louisville; Louisville KY USA