T. Steiner
Department of Neuromedicine and Movement Science, NTNU Norwegian University of Science and Technology, Edvard Griegs gate, Trondheim, Norway, Division of Brain Sciences, Imperial College London, London, UK
L. Stovner
Department of Neuromedicine and Movement Science, NTNU Norwegian University of Science and Technology, Edvard Griegs gate, Trondheim, Norway, Norwegian Advisory Unit on Headache, Department of Neurology and Clinical Neurophysiology, St Olavs University Hospital, Trondheim, Norway
R. Jensen
Danish Headache Centre, Department of Neurology, University of Copenhagen, Rigshospitalet Glostrup, Glostrup, Denmark
D. Uluduz
Neurology Department, Cerrahpaşa School of Medicine, Istanbul University, Istanbul, Turkey
Z. Katsarava
Evangelical Hospital Unna, Unna, Germany, Department of Neurology, University of Duisburg-Essen, Essen, Germany, EVEX Medical Corporation, Tbilisi, Georgia, IM Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russian Federation