Funding for this research was provided by:
National Hospital Organization
Received: 21 October 2020
Accepted: 15 December 2020
First Online: 28 January 2021
Ethics approval and consent to participate
: This study protocol was reviewed and approved by the University of Tsukuba Research Ethics Committee, Nagasaki University Research Ethics Committee, and the NHO central Institutional Review Board. Informed consents in writing were obtained from all the participants. The study was performed in accordance with the principles expressed in the Declaration of Helsinki.
: Not required.
: HY was supported by research grants from AbbVie GK. The other authors declare no financial or commercial conflicts of interest.