Funding for this research was provided by:
Grant-in-Aid for Scientific Research (C) from Japan Society for the Promotion of Science (25461507, 19K08956)
Text and Data Mining valid from 2020-02-01
Received: 8 September 2019
Accepted: 31 January 2020
First Online: 7 February 2020
Compliance with Ethical Standards
: This study was performed with the approval of the Ethics Committee at the School of Medicine, Niigata University (Approval number; 1413), and complied with the Declaration of Helsinki. All subjects provided informed consent.