1. Rheumatology department , Kassab orthopedics institute , Ksar Saïd , Tunisia
2. Faculty of medicine of Tunis , University Tunis el Manar , Tunisia
3. Research unit UR17SP04, 2010, Ksar Said 2010, Tunis , Tunisia
4. Pediatric orthopedics department , Kassab orthopedics institute , Ksar Saïd , Tunisia