Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0723-2020(12)00047-1
	subscription/membership/fee required	ClinicalKey	https://www.clinicalkey.com/content/playBy/pii?v=S0723-2020(12)00047-1
Full text from	free resource	Hokkaido University Collection of Scholarly and Academic Papers: HUSCAP	http://hdl.handle.net/2115/49939
SILVA SSU Database	free resource	SILVA	http://www.arb-silva.de/search/show/ssu/pubid/22504019