Funding for this research was provided by:
Japanese Association of Dialysis Physicians (2013-14)
Received: 16 December 2018
Accepted: 24 May 2019
First Online: 16 July 2019
Ethics approval and consent to participate
: The authors of this manuscript declare that they have complied with the Principles of Ethical Publishing presented in the Declaration Helsinki and that the study protocol was approved by a local ethics committee. This study was approved by the Ethics Committee of the Juntendo University (approval no. 13-085) and registered with the University Hospital Medical Information Network (UMIN000011965).
: All patients, or their legally acceptable representatives, provided informed consent prior to entering the study.
: The authors declare that they have no competing interests.