Funding for this research was provided by:
Grants-in-Aid from the Ministry of Education, Culture, Sports, Science and Technology of Japan for Scientific Research (26293196, 26461216)
Grants-in-Aid from the Ministry of Education, Culture, Sports, Science and Technology of Japan for Young Scientists (25870245)
Grants-in-Aid for the Practical Research Project for Renal Diseases from the Japan Agency for Medical Research and Development (18ek0310007h0003)
Received: 12 September 2019
Accepted: 22 November 2019
First Online: 2 December 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Ethics Committee of Niigata University (approval number: 2015–1789). The study population included 45 patients who had given written informed consent.
: Not applicable.
: AS received a research grant from Denka Seiken Co., Ltd. The other authors declare they have no competing interests.