1. Headache Classification Committee of the International Headache Society (IHS). The International Classification of Headache Disorders 3rd edition. Cephalalgia 38, 1–211 (2018). This and earlier versions of the classification provide operational diagnostic criteria and constitute the basis for migraine epidemiology, although they are primarily for clinical use.
2. Stovner, L. J. et al. Global, regional, and national burden of migraine and tension-type headache, 1990–2016: a systematic analysis for the Global Burden of Disease Study 2016. Lancet Neurol. 17, 954–976 (2018). The most detailed description of the methods for and results from the analysis of headache data in the Global Burden of Disease Study.
3. World Health Organization. Atlas of Headache Disorders and Resources in the World 2011 (WHO, 2011). A useful document from the WHO for those advocating for the allocation of more resources to headache care or research.
4. Steiner, T. J. et al. Migraine remains second among the world’s causes of disability, and first among young women: findings from GBD2019. J. Headache Pain. 21, 137 (2020).
5. Institute of Health Metrics and Evaluation. Global Burden of Disease Study 2019 is here! IHME https://mailchi.mp/healthdata/07022020-2871488?e=99a49e288b (2019).