Electronic archiving with PubMed Central--next steps into the future.
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D000818:Animals; D002170:Canada; D006801:Humans; D009317:National Library of Medicine (U.S.); D010506:Periodicals as Topic / Q000191:economics / Q000592:standards*; D039781:PubMed; D012952:Societies / Q000191:economics; D014481:United States; D014730:Veterinary Medicine / Q000592:standards