1. Department of Pain Medicine The James Cook University Hospital Middlesbrough UK
2. Division of Pain Medicine Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
3. MRC/CSO Social and Public Health Sciences Unit & Robertson Centre for Biostatistics, Institute of Health and Well Being University of Glasgow Glasgow UK
4. The Spine & Pain Institute of New York New York New York USA
5. Department of Anesthesiology NYU Langone Medical Center New York New York USA
6. Saluda Medical Pty Ltd. Artarmon New South Wales Australia
7. Liverpool Reviews and Implementation Group, Department of Health Data Science University of Liverpool Liverpool UK