About the Authors

Hideki Sudo

Contributed equally to this work with: Hideki Sudo, Katsuhisa Yamada

hidekisudo@yahoo.co.jp

Affiliation Department of Advanced Medicine for Spine and Spinal Cord Disorders, Hokkaido University Graduate School of Medicine, Sapporo, Japan

Katsuhisa Yamada

Contributed equally to this work with: Hideki Sudo, Katsuhisa Yamada

Affiliation Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan

Koji Iwasaki

Affiliation Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan

Hideaki Higashi

Affiliation Division of Infection and Immunity, Hokkaido University Research Center for Zoonosis Control, Sapporo, Japan

Manabu Ito

Affiliation Department of Advanced Medicine for Spine and Spinal Cord Disorders, Hokkaido University Graduate School of Medicine, Sapporo, Japan

Akio Minami

Affiliation Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan

Norimasa Iwasaki

Affiliation Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: HS. Performed the experiments: HS KY KI. Analyzed the data: HS KY HH. Contributed reagents/materials/analysis tools: HS MI AM NI. Wrote the paper: HS.