Name	Info	Provider	Link
	free resource	J-STAGE, Japan Science and Technology Information Aggregator, Electronic	https://dx.doi.org/10.2188/jea.JE20180039
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/30344197/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/30344197
Full text from	free resource	Diposit Digital de la Universitat de Barcelona	http://hdl.handle.net/2445/157178