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平台:
BioMed Central Open Access
(Available from 2001/12/01 volume: 1 issue: 1 until 2020/12/31 volume: 20 issue: 1.)
DOAJ Directory of Open Access Journals
(Available from 2001 until 2020.)
EBSCOhost Academic Search Complete
(Available from 2001/01/01.)
EBSCOhost Health Policy Reference Center
(Available from 2001/01/01 until 2020/12/14.)
EBSCOhost STM Source
(Available from 2001/01/01 until 2020/12/14.)
ProQuest Agricultural & Environmental Science Database
(Available from 2009/01/01 volume: 9 until 2020/01/31 volume: 20.)
ProQuest SciTech Premium Collection
(Available from 2009/01/01 volume: 9 until 2020/01/31 volume: 20.)
PubMed Central Open Access
(Available from 2001 volume: 1 until 2020 volume: 20.)
SpringerLink Open Access
(Available from 2001/12/01 volume: 1 issue: 1 until 2020/12/31 volume: 20 issue: 1.)