At a recent PubMed Central National Advisory Committe meeting, David Lipman (Director of NCBI) gave a presentation on the current status of PubMed Central which included the following data: Over 1.9 million articles are available in PMC. (Expected to hit 2 million by end of June '10); Participating journals: 640 full participants;
A Wed, study studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: