Received: 7 June 2020
Accepted: 19 October 2020
First Online: 27 October 2020
Ethics approval and consent to participate
: This study was approved by the institutional review board at the International University of Health and Welfare Hospital (Approval No. 13-B-389) and conforms to the ethical guidelines of the 1975 Declaration of Helsinki. Informed consent was omitted and information of this study was disclosed in the form of opt-out on our hospital website.
: Not applicable.
: The authors declare that they have no competing interests.