1 Department of Gastroenterology, Lyell McEwin and Modbury Hospitals, Northern Adelaide Local Health Network (NALHN), University of Adelaide, Adelaide, SA, Australia.
2 Division of Gastroenterology and Hepatology, Center for Esophageal Diseases and Swallowing, Center for Gastrointestinal Biology and Disease, University of North Carolina School of Medicine, Chapel Hill, North Carolina.