Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S1087-1845(18)30015-X
	free resource	scite Smart Citations	https://scite.ai/reports/29409964
SILVA SSU Database	free resource	SILVA	http://www.arb-silva.de/search/show/ssu/pubid/29409964