**4. Materials and Methods**

A prospective clinical study (NCT04413916) was conducted at the Department of Nephrology, University Medical Centre Ljubljana, Slovenia and the Institute of Pathology, Faculty of Medicine, University of Ljubljana. The study was approved by the National Medical Ethics Committee of the Republic of Slovenia (permit number 24k/06/12 approved on 15/06/2012 and 0120-625/2017/4 on 18/12/2017 (revised version number 0120-625/2017/11 on 12/12/2019)) and conducted in accordance with the Declaration of Helsinki. All patients signed informed consent.
