Burden and attitude to resistant and refractory migraine: a survey from the European Headache Federation with the endorsement of the European Migraine & Headache Alliance

Simona Sacco, Christian Lampl, Antoinette Maassen van den Brink, Valeria Caponnetto, Mark Braschinsky, Anne Ducros, Patrick Little, Patricia Pozo-Rosich, Uwe Reuter, Elena Ruiz de la Torre, Margarita Sanchez Del Rio, Alexandra J Sinclair, Paolo Martelletti, Zaza Katsarava, Burden and Attitude to Resistant and Refractory (BARR) Study Group, Lars Edvinsson (Member of author group)