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平台:
BMJ Journals
(Available from 2007.)
BMJ Journals Archive
(Available from 1960 volume: 1 issue: 1 until 2006.)
ProQuest SciTech Premium Collection
(Available from 1960/03/01. Most recent 6 month(s) not available.)
PubMed Central
(Available from 1960 volume: 1 until 2007 volume: 56 issue: 12.)