1. Department of pediatric Orthopaedic Surgery, Lyon University Hospital for Mother and Children, Bron, France
2. Pediatric Orthopaedic Surgery Unit, Cliniques Universitaires UCL Saint-Luc Bruxelles, Grand Hopital de Charleroi, Charleroi, Belgium
3. Surgical and Orthopaedic Research Laboratory, Prince of Wales Clinical School University of New South Wales, Sydney, Australia