Received: 28 July 2020
Accepted: 25 January 2021
First Online: 11 February 2021
Ethics approval and consent to participate
: This study was approved by the ethical committee of Toho University Sakura Medical Center (No. 2012071). Verbal informed consent was obtained from all participants because the investigation of VAS and ODI are noninvasive and beneficial for all the patients to know their real condition. The ethical committee approved this procedure.
: Not applicable.
: The authors declare that they have no competing interests.