Name	Info	Provider	Link
	free resource	Medicina Oral S.L.	http://www.medicinaoral.com/pubmed/medoralv17_i6_pe943.pdf
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22549677/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/22549677