Received: 17 November 2019
Accepted: 3 August 2020
First Online: 10 August 2020
Ethics approval and consent to participate
: This study was approved by the institutional review board Ethics Committee of the University of Yamanashi School of Medicine, Chairperson Zentarou Yamagata (Application number 1183).
: Not applicable.
: The first author Tetsuro Ohba is an Editorial Board member for the journal.