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Published 2013
Full text available in SpringerLink Journals Fully Open Access: 1991 to presentFull text available in BioMed Central: 1991 to present
Full text available in DOAJ: Directory of Open Access Journals: 2013 to present
Full text available in PubMed Central (PMC) Open Access: 2013 to present
Electronic
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Published 2011
Full text available in EBSCO Open Access Journals: 2011 - 2014
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Published 1991
Full text available in Springer Nature Complete Journals: 1997 - 2012
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