1. University Medical Centre, Department of Rheumatology, Ljubljana, Slovenia
2. Charles University, Medical School, Department of Gynecology and Obstetrics, Plzen- Lochotin, Czech Republic
3. Jagiellonian University Medical College, Department of Medicine, Krakow, Poland
4. Bezhanijska Kosa, University Medical Centre, Belgrade University, Serbia
5. Sapienza University of Rome, Dipartimento di Medicina Interna e Specialità Mediche, Rome, Italy
6. University Medical Centre, University Children’s Hospital Ljubljana, Department of Allergology, Rheumatology and Clinical Immunology, Ljubljana, Slovenia
7. Maastricht University Medical Center, Division of Clinical and Experimental Immunology, Department of Internal Medicine, Maastricht, the Netherlands
8. University in Ljubljana, Faculty of Pharmacy, Chair for Clinical Biochemistry, Ljubljana, Slovenia