Name	Info	Provider	Link
Full text from DIGITALCSIC	free resource	Digital CSIC Spanish National Research Council	http://hdl.handle.net/10261/266047
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=34141989.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/34141989/
Full Text at the institutional repository	free resource	Andalusian Health Repository	http://hdl.handle.net/10668/18016
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/34141989
	free resource	Wiley	https://onlinelibrary.wiley.com/doi/10.1002/hep4.1698
Full text from	free resource	Digital Repository of the University of Navarra	http://hdl.handle.net/10171/62149
	free resource	Wolters Kluwer	https://doi.org/10.1002/hep4.1698