1. Xenotransplantation Research Center, Seoul National University College of Medicine, Seoul, Korea
2. Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul, Korea
3. Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
4. Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
5. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea
6. Biomedical Research Institute, Seoul National University Hospital, Seoul, Korea