This web page helps you convert any PubMed ID (PMID) into the corresponding digital object identifier (DOI) if any. It works for the PubMed-indexed journal articles. The journal articles indexed by PubMed Central (PMC) have PMIDs, too. Hence, you can use this tool for PMC-indexed articles, as well. PMC has another article identifier conversion
tool limited to the PMC-indexed articles.
By the way, we have DOI to PMID converter and PMID to citation counts, too!
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