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APA Citation
Gaul, C., Diener, H., Silver, N., Magis, D., Reuter, U., Andersson, A., Liebler, E. J., Straube, A., & , (2016). non-invasive vagus nerve stimulation for PREVention and Acute treatment of chronic cluster headache (PREVA): A randomised controlled study. Cephalalgia, 36, 534–546. http://access.bl.uk/ark:/81055/vdc_100064345834.0x000018