[1] Univ Hosp Leicester, Trauma & Orthopaed, Leicester, Leics, England
[2] East Lancashire NHS Hosp, Trauma & Orthopaed, Blackburn, Lancs, England
[3] Univ Cambridge, Psychol, Cambridge, England
[4] Hull Univ Teaching Hosp NHS Trust, Trauma & Orthopaed, Kingston Upon Hull, N Humberside, England