Pruvey, C., Dyson, C., Keene, D., Harvey, L., Phillips, R., & Mitchell, J. (2004). Is cervical spine rotation, as used in the standard vertebrobasilar insufficiency test, associated with a measureable change in intracranial vertebral artery blood flow?. Manual Therapy, 9(4), 220-227. https://doi.org/10.1016/j.math.2004.03.005