1. Department of Pediatrics and Adolescent Medicine, Institute of Medical Biochemistry and Laboratory Diagnostics, Charles University First Faculty of Medicine, Prague, Czech Republic;
2. Department of Nephrology, Graduate School of Medicine, Nippon Medical School, Tokyo, Japan;
3. Department of Pediatrics and Adolescent Medicine, Institute of Rheumatology, Charles University First Faculty of Medicine, Prague, Czech Republic;
4. Department of Pediatrics and Adolescent Medicine, Charles University First Faculty of Medicine, Prague, Czech Republic;
5. Department of Applied Biological Chemistry, The University of Tokyo Graduate School of Agricultural and Life Sciences Faculty of Agriculture, Bunkyo-ku, Japan;
6. Division of Kidney and Hypertension, Department of Pathophysiology, Jikei University School of Medicine, Tokyo University of Pharmacy and Life Sciences, Tokyo, Japan