1. PubMed and PubMed Central
Operated by the US National Library of MedicinePubMed is a citation database; PubMed Central (PMC) is a full-text repository maintained by the National Library of Medicine (NLM). A journal being indexed in PubMed, having a PMC deposit arrangement, and simply holding an NLM Catalog record are three distinct statuses, and only the former ensure your article will reliably appear. NLM selection requires a sustained publication history and review of the journal's editorial and ethics policies by the National Library of Medicine.