Ouchi, Kotaro
Oki, Yohei
Sakuma, Toru
Ojiri, Hiroya
Article History
Received: 16 February 2020
Accepted: 17 April 2020
First Online: 15 May 2020
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: This type of study does not require formal consent.
: The institutional review boards of the participating institutions approved this retrospective study and waived the need for documentation of informed consent. Informed consent was obtained in the form of opt-out on the Web site [Approval Number: 31-285(9784)].
: This retrospective study does not require formal consent.