Name	Info	Provider	Link
	free resource	Digital CSIC Spanish National Research Council	http://hdl.handle.net/10261/134697
Blood Transfusion and Donation	free resource	MedlinePlus Health Information	https://medlineplus.gov/bloodtransfusionanddonation.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23736936/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/23736936
	free resource	Data Conversion Labs	https://doi.org/10.2450/2013.0237-12