How many neck adjustments cause stroke?

It often claimed that chiropractors cause strokes. But how many, and how frequently? I dig into the research behind one popular estimate. PAPERS CITED Assendelft, W. J., Bouter, L. M., & Knipschild, P. G. (1996). Complications of spinal manipulation: A comprehensive review of the literature. The Journal of Family Practice, 42(5), 475–480. Gouveia, L. O., Castanho, P., & Ferreira, J. J. (2009). Safety of chiropractic interventions: A systematic review. Spine (Philadelphia, Pa. : 1986), 34(11), E405-13. https://doi.org/10.1097/BRS.0b013e318... Gross, A. R., Kay, T. M., Kennedy, C., Gasner, D., Hurley, L., Yardley, K., Hendry, L., & McLaughlin, L. (2002). Clinical practice guideline on the use of manipulation or mobilization in the treatment of adults with mechanical neck disorders. Manual Therapy, 7(4), 193–205. https://doi.org/10.1054/math.2002.0477 Haynes, M. J. (1994). Stroke following cervical manipulation in Perth. Chiropractic Journal of Australia, 24, 42–46. Nielsen, S. M., Tarp, S., Christensen, R., Bliddal, H., Klokker, L., & Henriksen, M. (2017). The risk associated with spinal manipulation: An overview of reviews. Systematic Reviews, 6(1), 64. https://doi.org/10.1186/s13643-017-04... Gregory P. Grieve (with Internet Archive). (1986). Modern Manual Therapy of the Vertebral Column. Churchill Livingstone. http://archive.org/details/isbn_04430... Greenberg, S. A. (2009). How citation distortions create unfounded authority: Analysis of a citation network. BMJ, 339(jul20 3), b2680–b2680. https://doi.org/10.1136/bmj.b2680 TIMESTAMPS 00:00 "1 in 20,000"? 00:27 "Studies show..." 00:44 Finding the trail 02:17 The Original Source Revealed 03:57 Citation Distortion 05:07 Conclusion