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Kernick, D., & Goadsby, P. (2008-11). Alternative approaches where evidence is awaited or contested. In Headache: A Practical Manual. Oxford, UK: Oxford University Press. Retrieved 3 Jun. 2020, from https://oxfordmedicine.com/view/10.1093/med/9780199232598.001.0001/med-9780199232598-chapter-18.