[1] Nottingham Univ Hosp NHS Trust, Dept HCOP, Nottingham, England
[2] Nottingham Univ Hosp NHS Trust, Ctr Spinal Studies & Surg, Nottingham, England
[3] Univ Nottingham, Nottingham, England
[4] Natl Inst Hlth Res NIHR Nottingham Biomed Res Ctr, Nottingham, England
[5] Univ Malaya, Fac Med, Kuala Lumpur, Malaysia