1. Headache Science Center, C. Mondino National Neurological Institute, Italy
2. Department of Neuroscience, Norwegian University of Science and Technology, Norway
3. Norwegian Advisory Unit on Headaches, St Olav’s University Hospital, Trondheim, Norway
4. Università del Piemonte Orientale “A. Avogadro,” Department of Pharmaceutical Sciences, Italy
5. Headache Group – NIHR-Wellcome Trust Clinical Research Facility, King’s College London, UK
6. Department of Brain and Behavioural Sciences, University of Pavia, Italy