Funding for this research was provided by:
Grant-in-Aid for Scientific Research (19K17747)
Received: 23 November 2018
Accepted: 28 May 2019
First Online: 7 June 2019
Ethics approval and consent to participate
: This study was approved by the ethics committees of Nagasaki University Hospital (Nagasaki, Japan) (1602221–2) and Nagasaki Renal Center (Nagasaki, Japan) (30001). The ethics committees waived the requirement for written consent due to the retrospective record-based design.
: Not applicable.
: The authors declare that they have no competing interests.