1. Division of Orthopedic Surgery, Department of Regenerative and Transplant Medicine; Niigata University Graduate School of Medical and Dental Sciences; 1-757 Asahimachi Dori, Chuo-Ku Niigata City 951-8510 Japan
2. Division of Anesthesiology; Niigata University Graduate School of Medical and Dental Sciences; 1-757 Asahimachi Dori, Chuo-Ku Niigata City 951-8510 Japan