Case-control studies are observational studies that aim to find risk factors for a certain disease. More about the study design is explained in this video.
References:
https://pubmed.ncbi.nlm.nih.gov/32658653/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1706071/
Paper Doll & Hill: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2022425/?page=1
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Music:
Icelandic Arpeggios – DivKid (YouTube Audio Library)
https://www.youtube.com/watch?v=pxoq8jEGbBo