1. Trauma and Orthopaedics, Croydon University Hospital , 530 London Road, London CR7 7YE, UK
2. Al-Kindy University , Mohamed Al-Qasim Expy, Baghdad, Iraq
3. Trauma and Orthopaedics, University College London Hospital , 235 Euston Road, London NW1 2BU, UK
4. America Hip Institute , 999 E Touhy Ave # 450, Chicago 60018, USA
5. Northwestern University , 633 Clark Street, Chicago, IL 60208, USA
6. University Hospitals Coventry and Warwickshire , Clifford Bridge Road, Coventry CV2 2DX, UK
7. South West London Elective Orthopaedic Centre , Dorking Road, London KT18 7EG, UK
8. Rosebank Centre for Sports Medicine and Orthopaedics and Fourways Life Hospital , 9 Sturdee Avenue, Johannesburg, South Africa