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Results by year

Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1985 1
1988 1
1989 1
1992 1
1993 1
1995 1
2000 1
2001 5
2002 7
2003 9
2004 10
2005 18
2006 13
2007 13
2008 31
2009 43
2010 46
2011 24
2012 26
2013 34
2014 28
2015 18
2016 25
2017 24
2018 19
2019 22
2020 24
2021 29
2022 21
2023 18
2024 5
2025 1
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    The PMC Open Access Subset includes journal articles and preprints that are made available under license terms that allow reuse. Historical back issues refers to digitized content from print journals made available in PMC through the Biomedical Journal Digitization Projects.

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Full text in PMC for id: 1636

Embargoed Articles:

The embargo is the time during which the publisher retains exclusive rights to distribute articles. Those articles are made freely available on the PMC website after the embargo period has ended. Citations for articles under an embargo period will still display in the PMC results list by default. Choose "Exclude" to prevent embargoed articles from displaying in your results.

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