1. Department of Hepatobiliary and Pancreatic Surgery, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Surgery, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea.
3. meerecompany Inc., Hwasung, Korea.
4. Robot and MIS Center, Severance Hospital, Seoul, Korea.
5. Department of Laboratory Animal Resources, Yonsei University College of Medicine, Seoul, Korea.