[1] British Soc Childrens Orthopaed Surg, London, England
[2] Univ Liverpool, Inst Translat Med, Liverpool, Merseyside, England
[3] Univ Oxford, Oxford, England
[4] Univ Oxford, Botnar Res Ctr, Orthopaed Surg, Oxford, England
[5] Univ Oxford, Botnar Res Ctr, Oxford, England
[6] Univ Hosp Coventry & Warwick, Coventry, W Midlands, England
[7] UCL, Surg & Clin Epidemiol, UCL GOS Inst Child Hlth, London, England
[8] Royal Hosp Sick Children, Edinburgh, Midlothian, Scotland
[9] Sheffield Childrens Hosp, Sheffield, S Yorkshire, England