1. Pediatric Rheumatology Unit, Department of Pediatrics, Meir Medical Center , Kfar Saba, Israel
2. School of Medicine, Faculty of Medical and Health Sciences, Tel Aviv University , Tel Aviv, Israel
3. Pediatric Orthopedic Department, Dana-Dwek Children's Hospital, Sourasky Medical Center , Tel Aviv, Israel
4. Division of Rheumatology, Bambino Gesù Children’s Hospital IRCCS , Rome, Italy
5. Rheumatology Section, Department of Pediatrics, Hospital Italiano de Buenos Aires , Buenos Aires, Argentina
6. Division of Endocrinology and Metabolism, Institute for Human Genetics, The Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Department of Medicine, University of California , San Francisco, USA