Denne artikel fra PubMed er trukket tilbage fra United States National Library of Medicine.
https://pubmed.ncbi.nlm.nih.gov/32668870/
Archive.org wayback machine:
https://web.archive.org/web/20200722081915/https://pubmed.ncbi.nlm.nih.gov/32668870/
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https://en.wikipedia.org/wiki/PubMed
https://en.wikipedia.org/wiki/United_States_National_Library_of_Medicine