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DOAJ Directory of Open Access Journals
(Available from 2006.)
ProQuest SciTech Premium Collection
(Available from 2006/01/01 until 2006/12/31. Available from 2008/01/01 until 2008/12/31. Available from 2010/01/01. Most recent 6 month(s) not available.)
PubMed Central
(Available from 2018 volume: 55.)