Division of Rheumatology and Immunology, Department of Pediatrics, Referral Centre for Pediatric and Adolescent Rheumatology Republic of Croatia, University of Zagreb School of Medicine, University Hospital Centre Zagreb, Kišpatićeva 12, 10000, Zagreb, Croatia

Nastasia Kifer, Mario Sestan, Martina Held, Marijan Frković & Marija Jelusic

Department of Pathology and Cytology, University of Zagreb School of Medicine, University Hospital Centre Zagreb, Zagreb, Croatia

Stela Bulimbasic & Marijana Coric

Department of Biophysics, University of Zagreb Faculty of Pharmacy and Biochemistry, Zagreb, Croatia

Domagoj Kifer

Division of Rheumatology and Immunology, Department of Paediatrics, University of Split School of Medicine, University Hospital Centre Split, Split, Croatia

Sasa Srsen

Department of Internal Medicine, Clinical Hospital Holly Spirit, University of Zagreb School of Medicine, Zagreb, Croatia

Ana Gudelj Gracanin

Pediatric Rheumatology Service, Dana Dwek Children’s Hospital, Tel Aviv Medical Center, Tel Aviv University, Tel Aviv, Israel

Merav Heshin-Bekenstein

Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy

Teresa Giani & Rolando Cimaz

ASST Pini-CTO, Milan, Italy

Rolando Cimaz

Children’s Hospital Zagreb, University of Osijek, Medical Faculty Osijek, Osijek, Croatia

Alenka Gagro