Name	Info	Provider	Link
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/30934177/
	free resource	Georg Thieme Verlag Stuttgart, New York	https://www.thieme-connect.com/DOI/DOI?10.5999/aps.2017.01690
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/30934177
	free resource	M2PI	http://e-aps.org/journal/view.php?doi=10.5999/aps.2017.01690