1. 2nd Orthopaedic Department, General Hospital of Thessaloniki “Papageorgiou”, Ring Road-N. Eukarpia, 56403 Thessaloniki, Greece
2. School of Medicine, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Greece
3. Department of Trauma and Orthopaedics, St George’s University Hospital, London, UK
4. Department of Orthopaedics, Great Ormond Street Hospital, London, UK