1. Spine and Low Back Pain Center, Kitasuma Hospital, Kyoto 654-0102, Japan
2. Department of Orthopedic Surgery, Kansai Medical University Medical Center, Osaka 570-8507, Japan
3. Department of Orthopaedic Surgery, Osaka Metropolitan University, Osaka 545-8585, Japan
4. Department of Radiology, Shinkomonji Hospital, Fukuoka 800-0057, Japan
5. Department of Orthopaedic Surgery, School of Medicine, International University of Health and Welfare, Chiba 286-0048, Japan
6. Department of Orthopedic Surgery, School of Medicine, Kitasato University, Sagamihara 252-0375, Japan
7. Department of Orthopaedic Surgery, Faculty of Medicine, Saga University, Saga 849-8501, Japan
8. Department of Orthopaedic Surgery, Tohoku Medical and Pharmaceutical University, Sendai 983-8536, Japan
9. Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo 160-8582, Japan
10. Society for Minimally Invasive Spinal Treatment, Tokyo 101-0063, Japan