PubMed, MEDLINE and PubMed Central are all funded by the National Library of Medicine but are different databases. PubMed has been reported to include some articles published in predatory journals.

Objective To quantify the time lag between biomedical articles and the studies they describe as “recent,” a term widely used to imply timeliness despite rarely reflecting the actual age of the cited ...

For example, I used to use the south Indian form of my name: T. Biji Kurien, with Biji being my personal name. I have seven publications cited incorrectly in PubMed as being by 'Kurien, T. B.', ...