Funding for this research was provided by:
Japan Society for the Promotion of Science (No. 18K09999)
Received: 12 April 2019
Accepted: 18 July 2019
First Online: 25 July 2019
Ethics approval and consent to participate
: This study was approved by the institutional review board of Kanazawa University (No. 1263). The requirement for written informed consent was waived considering the study involved the use of anonymized data.
: Not applicable.
: The authors declare that they have no competing interests.