1. Department of Paediatrics, Clinical Sciences Lund, Lund University, Lund, Sweden
2. Department of Medical and Health Sciences and Department of Nephrology, Linköping University, Linköping, Sweden
3. Clinical Epidemiology Unit, Clinical Sciences Lund, Lund University, Lund, Sweden
4. Department of Rheumatology, Clinical Sciences Lund, Lund University, Lund, Sweden
5. Department of Renal Medicine, Vasculitis and Lupus Clinic, Addenbrooke’s Hospital, Cambridge, UK