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BioMed Central Open Access
(Available from 2004/06/01 volume: 1 issue: 1 until 2021/12/31 volume: 18 issue: 1.)
DOAJ Directory of Open Access Journals
(Available from 2004.)
EBSCOhost OmniFile Full Text Select
(Available from 2009/08/01 until 2022/04/02.)
PubMed Central Open Access
(Available from 2004 volume: 1.)
SpringerLink Open Access
(Available from 2004/06/01 volume: 1 issue: 1 until 2021/12/31 volume: 18 issue: 1.)
Taylor & Francis Open Access
(Available from 2005/06/01 volume: 2 issue: 1.)