Name	Info	Provider	Link
	free resource	Digital CSIC Spanish National Research Council	http://hdl.handle.net/10261/193965
	free resource	Public Library of Science	https://dx.plos.org/10.1371/journal.pmed.1002961
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/31671150/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/31671150