COMMENT in The Lancet Neurology July 01, 2021 | Volume 20, ISSUE 7, P498-499 https://doi.org/10.1016/S1474-4422(21)00163-0 Denys Fontaine, Michel Lantéri-Minet Cluster headache is a primary headache disorder characterised by attacks of strictly unilateral severe pain lasting 15–180 min, associated with prominent
