Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S1055-7903(13)00138-3
	free resource	scite Smart Citations	https://scite.ai/reports/23567022
SILVA SSU Database	free resource	SILVA	http://www.arb-silva.de/search/show/ssu/pubid/23567022