1. Pediatric Orthopedics, Timone, Aix-Marseille University, 264 rue Saint Pierre, 13005 Marseille, France
2. Aix-Marseille University, CNRS, ISM, Inst Movement Sci, Marseille, France
3. Spine Unit, Timone, Aix-Marseille University, 264 rue Saint Pierre, 13005 Marseille, France