Name	Info	Provider	Link
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/33569335/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/33569335
	free resource	AME Publishing Company	https://doi.org/10.21037/tlcr-20-420
Full text from	free resource	Diposit Digital de la Universitat de Barcelona	http://hdl.handle.net/2445/176022
	free resource	scite Smart Citations	https://scite.ai/reports/33569335