Received: 14 December 2018
Accepted: 30 June 2019
First Online: 5 July 2019
Ethics approval and consent to participate
: Local ethics committee (Pavlov First Saint Petersburg State Medical University, Russia) approval was obtained to conduct this study. All patients provided written consent to participate in the study.
: The patient depicted in Fig. InternalRef removed gave written informed consent for publication of their photograph.
: ZO is a member of the BMC Nephrology Editorial Board (Section Editor) and had no role in handling of this manuscript through peer review. All other authors declare that they have no financial or non-financial competing interests.