Wikipedia:PMID

The {{PMID}} template is used to create a link from a PMID codes for life sciences and biomedical articles to PubMed.

Example:

Correct: {{PMID|4957203}}PMID 4957203
Incorrect: PMID 4957203 → PMID 4957203
Incorrect: PMID:4957203 → PMID:4957203
Incorrect: PubMed 4957203 → PubMed 4957203