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2012 Society of American Gastrointestinal and Endoscopic Surgeons (SAGES)
- Endoscopic Submucosal Dissection (ESD) for Colorectal Tumors: 1000 colorectal ESD cases: the experiences of one specialist institute.

2012 Asian IBD symposium
- The incidence and characteristics of perianal problems in patients with ulcerative colitis in Korea.

2012 ESCP
- Foreign body reaction in the tract of anal fistulas

2013 Korean Society of Colorectal Surgeons
- Complex anal fistulas with anorectal openings