1 Institute of Kidney Disease Research, Department of Pediatrics, Yonsei University College of Medicine and Department of Pediatric Nephrology, Severance Children's Hospital, Seoul, Republic of Korea.
2 Department of Internal Medicine IV (Nephrology and Hypertension), Medical University Innsbruck, Innsbruck, Austria.
3 Pediatric Nephrology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
4 Department of Microbiology and Immunology, KU Leuven and Department of Nephrology, UZ Leuven, Leuven, Belgium.