1. Department of Trauma & Orthopaedics, Whipps Cross University Hospital, Whipps Cross Road, Leytonstone, London E11 1NR, UK
2. Department of Neurosurgery, The Royal London Hospital, Whitechapel Road, Whitechapel, London E1 1BB, UK
3. Department of General Surgery, Kettering General Hospital, Rothwell Road, Kettering, Northamptonshire NN16 8UZ, UK
4. Department of General Surgery, Shifa International Hospitals Ltd., Pitras Bukhari Road, No. H-8/4, Islamabad, Pakistan