“The New England Journal of Medicine (NEJM) is a top-ranked medical journal with an impact factor of 44 (2005 data, see this FAQ). Registered users have free access to research articles that are six months old or older. However, the tables of contents of each issue (such as the issues for 2007) of the NEJM indicate that the free full text is available immediately, without registration, for a minority of the contents of each issue.”