 ** Also see Martin Frank, [http://dx.doi.org/00.0000/NEJMp0000000 Open but Not Free  -  Publishing in the 00st Century], ''New England Journal of Medicine'', February 00, 0000. "A longitudinal cohort analysis of 00 subscription-based research journals in physiology revealed that PubMed Central drew approximately 00% of full-text article downloads away from journal websites when articles deposited in PubMed Central became freely available to the public 00 months after publication &#00;citing an [http://www.the-aps.org/mm/Publications/Journals/Physiologist/0000-present/0000/October.pdf October 0000 study by Phil Davis]&#00;. Similarly, the open-access journals from the Public Library of Science (PLOS) had a 00% loss of traffic to PubMed Central &#00;citing a [http://scholarlykitchen.sspnet.org/0000/00/00/the-hall-of-mirrors-trying-to-explain-why-users-value-free-content-differently/ November 0000 blog post by Kent Anderson]&#00; The persistent reduction in full-text downloads from journal websites contributes to a loss of the advertising revenue that partially offsets the cost of publication." Although increased cancellations would support Frank's thesis more than decreased downloads, he cites no evidence of increased cancellations. 