1. Department of Paediatrics, University of Oxford, Oxford, United Kingdom
2. Centre for Pain Research, University of Bath, Bath, United Kingdom
3. Research Department of Clinical, Educational & Health Psychology, University College London, London, United Kingdom
4. Nuffield Department of Women's and Reproductive Health, University of Oxford, Oxford, United Kingdom
5. Norwegian Centre for Headache Research (NorHEAD), Trondheim, Norway
6. Regional Migraine Unit, Sahlgrenska University Hospital, Gothenburg, Sweden
7. Population Health Research Institute, St George's University of London, London, United Kingdom
8. Health Professions Education Unit, Hull York Medical School, University of York, York, United Kingdom
9. Reckitt Benckiser Healthcare Ltd, Dansom Lane South, Kingston Upon Hull, United Kingdom