P. Rossi, H. Muller, M. A. de Pascual, P. Little, E. R. De La Torre, and on the B. of the E. C. H. Special Interest Group, “Cluster Headache (CH) and work life in the European Union: a survey from the european migraine and headache alliance”, Confinia Cephalal et Neurol, vol. 29, no. 1, pp. 63–69, May 2019.