Wente-Schulz, S., Department of Pediatric Nephrology, MHH, Hannover, Germany; Aksenova, M., Department of Pediatric Nephrology, Veltischev Research and Clinical Institute for Pediatrics, The Pirogov Russian National Research Medical University, Moskva, Russian Federation; Awan, A., Department of Pediatric Nephrology, Temple Street Children's University Hospital, Dublin, Ireland; Ambarsari, C.G., Department of Pediatric Nephrology, Cipto Mangunkusumo Hospital, Faculty of Medicine, University of Indonesia, Central Jakarta, Indonesia; Becherucci, F., Department of Pediatric Nephrology, Meyer Children's Hospital, Florence, Italy; Emma, F., Department of Pediatric Nephrology, Bambino Gesù Children's Hospital, Roma, Italy; Fila, M., Department of Pediatric Nephrology, Montpellier University, Arnaud de Villeneuve Hospital, Montpellier, France; Francisco, T., Department of Pediatric Nephrology, Dona Estefânia Hospital, Lisboa, Portugal; Gokce, I., Department of Pediatric Nephrology, Faculty of Medicine, Marmara University, Istanbul, Turkey; Gülhan, B., Department of Pediatric Nephrology, Faculty of Medicine, Hacettepe University, Ankara, Turkey; Hansen, M., KfH Centre of Pediatric Nephrology, Clementine Kinderhospital, Frankfurt am Main, Germany; Jahnukainen, T., Department of Pediatric Nephrology and Transplantation, New Children's Hospital, Helsinki University Hospital, Helsinki, Finland; Kallash, M., Department of Pediatric Nephrology, Nationwide Children's Hospital, Columbus, OH, United States; Kamperis, K., Department of Pediatric Nephrology, Aarhus University Hospital, Aarhus, Denmark; Mason, S., Department of Pediatric Nephrology, Connecticut Children's Medical Center, Hartford, CT, United States; Mastrangelo, A., Department of Pediatric Nephrology, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy; Mencarelli, F., Department of Pediatric Nephrology, Azienda Ospedaliero-Universitaria di Bologna, Ospedale S. Orsola-Malpighi, Bologna, Italy; Niwinska-Faryna, B., Department of Pediatric Nephrology, Karolinska University Hospital, Stockholm, Sweden; Riordan, M., Department of Pediatric Nephrology, Temple Street Children's University Hospital, Dublin, Ireland; Rus, R.R., Department of Pediatric Nephrology, University Children's Hospital, Ljubljana, Slovenia; Saygili, S., Department of Pediatric Nephrology, Faculty of Medicine, Istanbul University-Cerrahpasa, Istanbul, Turkey; Serdaroglu, E., Department of Pediatric Nephrology, Dr Behcet Uz Children Hospital, Izmir, Turkey; Taner, S., Department of Pediatric Nephrology, Faculty of Medicine, Ege University, Izmir, Turkey; Topaloglu, R., Department of Pediatric Nephrology, Faculty of Medicine, Hacettepe University, Ankara, Turkey; Vidal, E., Department of Pediatric Nephrology, University Hospital of Padova, Padova, Italy; Woroniecki, R., Department of Pediatric Nephrology, Stony Brook Children's Hospital, Stony Brook, NY, United States; Yel, S., Department of Pediatric Nephrology, Faculty of Medicine, Erciyes University, Kayseri, Turkey; Zieg, J., Department of Pediatric Nephrology, 2nf Faculty of Medicine, University Hospital Motol, Charles University, Praha, Czech Republic; Pape, L., Department of Pediatrics II, University Hospital Essen, Essen, Germany; Boyer, O., Hôpital Necker-Enfants malades, MARHEA, Institut Imagine, Université de Paris, Paris, France; Buder, K., Pediatric Department, University Hospital Carl Gustav Carus, Technical University, Dresden, Germany; Bulut, İ.K., Ege University Faculty of Medicine, Izmir, Turkey; Cornelissen, E.A.M., Radboud University Medical Center, Nijmegen, Netherlands; del Mar Espino Hernández, M., Hospital Universitario 12 de Octubre, Madrid, Spain; Hooman, N., Ali-Asghar Clinical Research Development Center, Iran University of Medical Sciences, Tehran, Iran; Kemper, M., Asklepios Medical School, Hamburg, Germany; Maquet, J., CHC Liège, Belgium; Santos, F., Pediatric Nephrology, Hospital Universitario Central de Asturias, University of Oviedo, Spain; Walden, U., Universitätsklinikum Kinderklinik Augsburg, Germany; The international TIN study group