1 Section of Advanced Endoscopy, Department of Gastroenterology, Hepatology and Nutrition, Digestive Disease and Surgery Institute, Cleveland Clinic, 9500 Euclid Avenue, A-31, Cleveland, OH 44195, USA. Electronic address: jangs@ccf.org.
2 Section of Advanced Endoscopy, Department of Gastroenterology, Hepatology and Nutrition, Digestive Disease and Surgery Institute, Cleveland Clinic, 9500 Euclid Avenue, A-31, Cleveland, OH 44195, USA. Electronic address: vargoj@ccf.org.