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APA Citation
Khil, L., Straube, A., Evers, S., & Berger, K. (2013). change in intraindividual ICHD-II headache diagnosis over time: A follow-up of the DMKG headache study. Cephalalgia, 33, 25–33. http://access.bl.uk/ark:/81055/vdc_100170576885.0x000009