1George Eliot Hospital NHS Trust, Trauma and Orthopaedic Surgery, Nuneaton, United Kingdom
2Nasser Institute for Research and Treatment, Trauma and Orthopaedic Surgery, Cairo, Egypt
3Ain Shams Univesity, Trauma and Orthopaedic Surgery, Cairo, Egypt
4Swiss Ortho Center, Schmerzklinik Basel, Swiss Medical Network, Trauma and Orthopaedic Surgery, Basel, Switzerland