1. International Visiting Colorectal Surgeon, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea
2. Division of Colorectal Surgery, Department of Surgery, Westmead Hospital, The University of Sydney Westmead Clinical School, Sydney, NSW, Australia
3. Division of Colorectal Surgery, Department of Surgery, Korea University Anam Hospital, Korea University College of Medicine, 02841, Inchon-ro 73, Seongbuk-gu,Seoul, Korea