Name	Info	Provider	Link
	free resource	Hindawi Limited	https://doi.org/10.1155/2012/972689
Birth Control	free resource	MedlinePlus Health Information	https://medlineplus.gov/birthcontrol.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22536011/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/22536011