[1] Univ Liverpool, Liverpool Reviews & Implementat Grp, Liverpool, England
[2] Saluda Med Pty Ltd, Artarmon, NSW, Australia
[3] James Cook Univ Hosp, Dept Pain Med, Middlesbrough, England
[4] Med Spectrum Twente, Dept Neurol & Neurosurg, Enschede, Netherlands
[5] Erasmus MC, Univ Med Ctr, Ctr Pain Med, Rotterdam, Netherlands
[6] Univ Glasgow, MRC, Off Social & Publ Hlth Sci Unit, Glasgow City, Scotland
[7] Univ Glasgow, Inst Hlth & Well Being, Robertson Ctr Biostat, Glasgow City, Scotland