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平台:
EBSCOhost Academic Search Complete
(Available from 2003/01/01 until 2011/01/31.)
EBSCOhost STM Source
(Available from 2003/01/01 until 2011/01/31.)
PubMed Central Open Access
(Available from 2003 volume: 1 until 2011 volume: 9.)
SpringerLink Open Access
(Available from 2003/12/01 volume: 1 issue: 1 until 2011/12/31 volume: 9 issue: 1.)