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Journals may be deselected from MEDLINE for various reasons including, but not limited to, extremely late publication patterns, major changes in the scientific quality or editorial process, and changes in ownership or publishers. NLM supports the publishing practices outlined by:

NLM expects PubMed journals to follow current standard best publishing practices. Over time, NLM reviews currently indexed MEDLINE journals. It is possible that a journal's MEDLINE status could change.