Name	Info	Provider	Link
	free resource	BioMed Central	https://reproductive-health-journal.biomedcentral.com/articles/10.1186/1742-4755-9-9
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22866753/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/22866753