Text and Data Mining valid from 2020-02-01
Received: 9 September 2019
Revised: 7 January 2020
Accepted: 22 January 2020
First Online: 3 February 2020
Compliance with ethical standards
: All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. This animal research was permitted by Yamanashi Prefectural research assessment committee (#251301).
: The authors declare that they have no conflict of interest.