Sakakibara, Ryuji http://orcid.org/0000-0002-5803-169X
Article History
Received: 20 October 2020
Accepted: 4 January 2021
First Online: 4 February 2021
Ethics declarations
:
: This article followed standard ethical consideration and was prepared according to the Declaration of Helsinki. Ethical approval was waived by the Local Ethics Committee in view of the retrospective nature of the study.
: The authors declare that they have no conflict of interest.
: None required because this is a review article.