1 Department of Colorectal Surgery, Ajou University Hospital, Yeongtong-gu, Suwon-si, Gyeonggi-do, Republic of Korea.
2 Graduate School of Medicine, Yonsei University College of Medicine, Seodaemun-gu, Seoul, Republic of Korea.
3 Division of Colorectal Surgery, Department of Surgery, Yonsei University College of Medicine, Seodaemun-gu, Seoul, Republic of Korea.
4 Division of Colorectal Surgery, Department of Surgery, Yonsei University College of Medicine, Seodaemun-gu, Seoul, Republic of Korea. [email protected].