International Classification of Headaches https://ihs-headache.org/wp-content/uploads/2020/05/ICHD-3-Pocket-version.pdf
Headache pathway: https://www.thewaltoncentre.nhs.uk/uploadedfiles/documents/Pathways/Headache%20pathway%20rev%20%20W%20Chesh%20APC%20-%20%20Pan%20Mersey%20rev%202020%20clarified%2012.20%20B.pdf
Headaches in over 12s: diagnosis and management NICE Guidelines CG150 https://www.nice.org.uk/guidance/cg150/ifp/chapter/treatments-for-migraine
