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Free full text from BORIS	free resource	Bern Open Repository and Information System	https://boris.unibe.ch/id/eprint/105774
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/28900902/
	subscription/membership/fee required	Springer	https://dx.doi.org/10.1186/s13613-017-0314-1
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/28900902
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	free resource	Spiral, Imperial College Digital Repository	http://hdl.handle.net/10044/1/50448
Full text from	free resource	White Rose Research Online	https://eprints.whiterose.ac.uk/122156/