The titles of journals in Vancouver format should be abbreviated according to the style used in the National Library of Medicine’s Journals in NCBI Databases. To find correct abbreviations:
Note that, in the citation, the abbreviation ends with a period and that when [journal on the Internet] comes after the title, the period goes after the close of the brackets. For example:
Gill JM, Cooper AR. Physical activity and prevention of type 2 diabetes mellitus.
Sports Med [journal on the Internet]. 2008 [cited 2012 Sep 5];38(10):807-24.
Do not underline or italicize the journal title abbreviation.
If you cannot find a particular journal title in the NLM database, check one of the following.
If you still cannot find an abbreviation, build one using the National Library of Medicine's Abbreviations for Commonly Used English Words in Journal Titles. For example, if you had an article from the fictitious Annals of Egyptian Nutrition, you would find the abbreviation for Annals (Ann), then the abbreviation for Egyptian (Egypt) and, finally, the abbreviation for Nutrition (Nutr) to come up with Ann Egypt Nutr.
Remember that regardless of where you find (or build) an abbreviation, it ends (only) with a period.
Journal names consisting of one word (e.g., Time, Science, Pharmacotherapy) are never abbreviated.