1. Department of Surgery, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Surgery, Fujita Health University, Toyoake-shi, Aichi, Japan.
3. Department of Surgery, College of Physicians and Surgeons, Columbia University, New York, NY, USA.
4. Robot and MIS Center, Yonsei University College of Medicine, Seoul, Korea.
5. Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea.