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Enter the exact version consulted. Internet sources are treated differently from print sources, and medical-journal abbreviations are never guessed.
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ICMJE says authors are responsible for citation accuracy and should verify references using PubMed or original sources.
ICMJE says retracted articles should not be cited except when discussing the retraction itself.
ICMJE instructs authors to abbreviate indexed journal titles according to MEDLINE/NLM Catalog style.