Received: 11 September 2018
Accepted: 29 May 2019
First Online: 10 June 2019
Ethics approval and consent to participate
: This research was a part of the research project approved by an institutional review board of Kyoto Prefectural University of Medicine (G-98).Human samples were collected from healthy adult volunteers who provided written consent.
: Not applicable.
: The authors declare that they have no competing interests.