Received: 15 October 2018
Accepted: 17 December 2018
First Online: 4 February 2019
Ethics approval and consent to participate
: The protocol of this study was approved by the ethics committee of Kanazawa University (approval no. 2017–040), as well as by the ethics committees of Kanazawa Municipal Hospital (approval no. 427–12-1), and conducted in accordance with the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.