1. Integrative Cancer Center, CHA Ilsan Medical Center, Goyang, Korea
2. Department of Oncology and Hematology, CHA Ilsan Medical Center, CHA University, Goyang, Korea
3. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Eunpyeong St. Mary's Hospital, Catholic University of Korea, Seoul, Korea
4. Department of Gastroenterology and Hepatology, Hanyang University College of Medicine, Guri, Korea