Article History
Received: 6 November 2020
Accepted: 21 December 2020
First Online: 5 January 2021
Compliance with ethical standards
:
: Yusuke Watanabe, Akihiko Osaki, Nobuo Waguri, and Shuji Terai declare that they have no conflict of interest.
: All procedures followed have been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments
: Informed consent was obtained from all patients for being included in the study.