About the Authors
- Takashi Ohnishi
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Affiliation Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan
- Hideki Sudo
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* E-mail: hidekisudo@yahoo.co.jp
Affiliation Department of Advanced Medicine for Spine and Spinal Cord Disorders, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan
- Koji Iwasaki
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Affiliation Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan
- Takeru Tsujimoto
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Affiliation Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan
- Yoichi M. Ito
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Affiliation Department of Biostatistics, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan
- Norimasa Iwasaki
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Affiliation Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: TO HS. Performed the experiments: TO HS. Analyzed the data: TO HS KI TT YMI NI. Contributed reagents/materials/analysis tools: HS. Wrote the paper: TO HS.