Funding for this research was provided by:
JSPS KAKENHI (17K07088, 18H02533, 17K07089)
Hirosaki University Institutional Research Grant (2019)
Received: 21 September 2019
Accepted: 29 September 2019
First Online: 28 October 2019
Ethics approval and consent to participate
: All studies and procedures were carried out with approval from the Committee of Medical Ethics, Hirosaki University Graduate School of Medicine, Hirosaki, Japan.
: The authors declare that they have no competing interests.