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subscription/membership/fee required Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S0039-6060(20)30758-3
Weight Loss Surgery free resource MedlinePlus Health Information https://medlineplus.gov/weightlosssurgery.html
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free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/33261823/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/33261823