ICMJE style citations follow National Library of Medicine style. Find complete guidelines for this style in the book Citing Medicine: The NLM Style Guide for Authors, Editors, and Publishers.
More about ICMJE Style
How do I cite an electronic journal article?
Author A, Author BB, Author CC. Title of article with only first important word capitalized: all other words in lowercase. Abbrev Jrnl Title. Year Mo D;Vol(iss):pages. doi: 10.1136/bmj.a2752. OR Available from: http://www.journal_article_URL.com/00000.html