Funding for this research was provided by:
Japan Society for the Promotion of Science (KAKENHI Grant Number JP 18K16626)
Received: 22 February 2020
Accepted: 30 August 2020
First Online: 4 December 2020
Ethics approval and consent to participate
: This retrospective study was approved by the Ethics Committee of Kyushu University Hospital (approval number: 30–478).
: Not applicable.
: All the authors declare that they have no conflict of interest.