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free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/30255349/
subscription/membership/fee required Springer https://dx.doi.org/10.1007/s40264-018-0736-1
free resource Europe PubMed Central https://europepmc.org/abstract/MED/30255349
free resource scite Smart Citations https://scite.ai/reports/30255349
free resource Spiral, Imperial College Digital Repository http://hdl.handle.net/10044/1/64639