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APA Citation
de Coo, I. F., van Oosterhout, W. P. J., Wilbrink, L. A., van Zwet, E. W., Ferrari, M. D., & Fronczek, R. (2019). chronobiology and Sleep in Cluster Headache. Headache, 59(7), 1032–1041. http://access.bl.uk/ark:/81055/vdc_100087072046.0x00005f