[1] Regional Hospital Lugano,Headache Center, Neurocenter of Southern Switzerland (NSI)
[2] King’s College London,Headache Group, Department of Basic and Clinical Neurosciences
[3] Norwegian University of Science and Technology,Department of Neuromedicine and Movement Science
[4] St. Olavs University Hospital,Norwegian Advisory Unit on Headache
[5] Rigshospitalet Glostrup,Danish Headache Center, Department of Neurology
[6] Università della Svizzera Italiana,Faculty of biomedical Sciences