Article History
Received: 25 November 2020
Accepted: 1 February 2021
First Online: 22 March 2021
Compliance with ethical standards
:
: Takahiro Muramatsu, Masakatsu Fukuzawa and Takao Itoi 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.