Funding for this research was provided by:
Japan Society for the Promotion of Science (17K10104)
Text and Data Mining valid from 2019-01-01
Received: 26 September 2018
Accepted: 3 December 2018
First Online: 12 January 2019
Compliance with Ethical Standards
: This study was performed following approval from the independent ethics committee of Shinshu University School of Medicine, Matsumoto, Japan; written informed consent was obtained from participants.
: The authors declare that they have no competing interests.