Funding for this research was provided by:
Japan Agency for Medical Research and Development (18hk0102049s0301)
The 106th Annual Congress of JSS Memorial Surgical Research Fund, Tokyo, Japan (none)
Received: 1 March 2019
Accepted: 15 August 2019
First Online: 19 August 2019
Ethics approval and consent to participate
: Each participant provided written, informed consent, and this study was approved by the institutional review board of Nihon University (RK-141209-4).
: Not applicable
: The authors declare that they have no competing interests.