Name	Info	Provider	Link
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/29521846/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/29521846
Full text from	free resource	Diposit Digital de la Universitat de Barcelona	http://hdl.handle.net/2445/171927
	free resource	scite Smart Citations	https://scite.ai/reports/29521846
	subscription/membership/fee required	Wolters Kluwer	https://doi.org/10.1097/PGP.0000000000000496