Scientific knowledge is increasing at a remarkable pace. In 2014, nearly 2.5 million peer-reviewed articles were published in 28 000 journals worldwide.1 Once available only through subscription print services, many scientific articles are now published with an open access (OA) license. In contrast to subscription services, OA publishers shift costs for articles to authors to make content available to readers at no direct cost.2 As of 2018, the Directory of Open Access Journals (http://www.doaj.org) reported more than 2.9 million articles published in more than 11 000 OA journals.
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Ganesh Kumar N, Meador KG, Drolet BC. Challenges in Open Access Publishing. JAMA Surg. 2018;153(10):875–876. doi:10.1001/jamasurg.2018.1741
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