1. Department of Orthopaedic Surgery, School of Medicine, International University of Health and Welfare, Narita 286-8686, Japan
2. Department of Orthopaedic Surgery, International University of Health and Welfare Narita Hospital, Narita 286-0124, Japan
3. Department of Orthopaedic Surgery, International University of Health and Welfare Mita Hospital, Tokyo 108-8329, Japan
4. Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo 160-0016, Japan
5. Society for Minimally Invasive Spinal Treatment (MIST), Tokyo 101-0063, Japan