1. Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Sweden
2. Children’s Clinic, Tartu University Hospital, Tartu, Estonia
3. Tallinn Children’s Hospital, Tallinn, Estonia
4. Institute of Clinical Medicine, Faculty of Medicine, Tartu University, Tartu, Estonia
5. Department of Clinical Immunology and Transfusion Medicine, Sahlgrenska University Hospital, Gothenburg, Sweden