Catalogue

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PubMed Central 01 Jan 2012 - 18 Apr 2018
Springer Standard Collection 01 Jan 2012 - present
Gale Cengage Academic OneFile 01 Jan 2012 - present
ProQuest Central 01 Jan 2010 - 31 Dec 2017
BioMed Central Open Access Free 01 Jan 2012 - present