Name	Info	Provider	Link
Menstruation	free resource	MedlinePlus Health Information	https://medlineplus.gov/menstruation.html
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:6265188
	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/endo/article-lookup/doi/10.1210/endo-109-2-356