Nakashima, Masayuki
Ide, Kazuki
Kawakami, Koji
Article History
Received: 1 April 2019
Accepted: 14 June 2019
First Online: 16 July 2019
Compliance with ethical standards
:
: K.K. received research funding from Olympus Corporation. M.N. and K.I. have no conflicts of interest to declare.