https://www.sciencedirect.com/science/article/abs/pii/S0003999313010605
I recall hearing this statistic at a conference a few months ago. It sobered me but did not surprise me. 1/4th of all motor vehicle accidents, even “minor” ones, is an awful lot of people walking around with some persistent mild head injury symptoms 12 months later. Chiropractic, nutrition, and some brain exercises, especially visual, is what it often takes to clear them up.