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1 Division of Gastroenterology, Department of Internal Medicine, Yeouido St. Mary's Hospital College of Medicine, The Catholic University of Korea, Seoul, South Korea.
2 Division of Gastroenterology and Hepatology, Department of Medicine, Mayo Clinic Arizona, Scottsdale, Arizona.
1 Division of Gastroenterology, Department of Internal Medicine, Yeouido St. Mary's Hospital College of Medicine, The Catholic University of Korea, Seoul, South Korea.
2 Division of Gastroenterology and Hepatology, Department of Medicine, Mayo Clinic Arizona, Scottsdale, Arizona.