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by pennaMan 1306 days ago
https://www.economist.com/graphic-detail/2019/06/25/what-is-...

https://bmjopen.bmj.com/content/2/4/e000774

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7649209/

I could go on and on but I think I gave you a good starting point for your own research