Name	Info	Provider	Link
Gallstones	free resource	MedlinePlus Health Information	https://medlineplus.gov/gallstones.html
	subscription/membership/fee required	Springer	https://doi.org/10.1007/s00464-010-1542-8
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:21424206