A lovely new peer reviewed journal article (Journal of the American Medical Association). You will love this one (and no, it's nothing to do with h*lm*ts - at least, not directly).
And did you notice: "Five of 6 highly-cited nonrandomized studies had been contradicted or had found stronger effects vs 9 of 39 randomized controlled trials (P = .008)."
Now what does that remind you of?
Thanks for the reference but the article is 11 pages long! I may have to learn how to read 🙁
And did you notice: "Five of 6 highly-cited nonrandomized studies had been contradicted or had found stronger effects vs 9 of 39 randomized controlled trials (P = .008)."