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BioMed Central Open Access
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EBSCOhost OmniFile Full Text Select
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EBSCOhost STM Source
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PubMed Central Open Access
(Available from 2008 volume: 7 until 2018 volume: 17.)
SpringerLink Open Access
(Available from 2008/12/01 volume: 7 issue: 1 until 2018/12/31 volume: 17 issue: 1.)