Correction of author affiliations Justine Naylor, Liverpool Hospital 26 August 2014 Andrew Hayen is affiliated with the School of Public Health and Community Medicine, not the Ingham Institute. Rajat Mittal is affiliated with the Orthopaedic Department, Liverpool Hospital, not the School of Public Health and Community Medicine. Justine Naylor and Ian Harris are affiliated with the SWS Clinical School, UNSW, not the School of Public Health and Community Medicine. Competing interests No competing interests
Correction of author affiliations
26 August 2014
Andrew Hayen is affiliated with the School of Public Health and Community Medicine, not the Ingham Institute.
Rajat Mittal is affiliated with the Orthopaedic Department, Liverpool Hospital, not the School of Public Health and Community Medicine.
Justine Naylor and Ian Harris are affiliated with the SWS Clinical School, UNSW, not the School of Public Health and Community Medicine.
Competing interests
No competing interests