Received: 26 March 2020
Accepted: 17 February 2021
First Online: 23 February 2021
Ethics approval and consent to participate
: This research was approved by the Clinical Research Ethics Committee of Niigata Spine Surgery Center and Niigata Rosai Hospital. Written informed consent was obtained from all patients.・Medical Corporation Aijinkai, IRB approval #4-2017・Niigata Rosai Hospital, IRB approval #1-2017
: Patients signed informed consent regarding publishing their data.
: The authors declare that they have no competing interest.