Funding for this research was provided by:
Grant-in-Aid for Scientific Research of Japan (26462321)
Received: 13 June 2019
Accepted: 10 October 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: Approval for the study was received from the Ethics Committee of Toho University Sakura Medical Center, and all patients gave their written consent to participate in this study (approval number: 2013–008). All activities were performed in accordance with the ethical standards set forth in the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interest.