World J Gastrointest Oncol 2016 Jul;8(7):555-62
Jae Min Lee, Hong Sik Lee, Jong Jin Hyun, Hyuk Soon Choi, Eun Sun Kim, Bora Keum, Yeon Seok Seo, Yoon Tae Jeen, Hoon Jai Chun, Soon Ho Um, Chang Duck Kim, Division of Gastroenterology and Hepatology, Department of Internal Medicine, Korea University College of Medicine, Seoul 02841, South Korea.