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

Year Number of Results
2001 1
2002 11
2003 12
2004 15
2005 30
2006 29
2007 41
2008 30
2009 46
2010 69
2011 69
2012 89
2013 124
2014 134
2015 136
2016 144
2017 181
2018 181
2019 230
2020 244
2021 264
2022 2
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1,872 results
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Page 1
Characteristics of COVID-19 infection in Beijing.
Tian S, Hu N, Lou J, Chen K, Kang X, Xiang Z, Chen H, Wang D, Liu N, Liu D, Chen G, Zhang Y, Li D, Li J, Lian H, Niu S, Zhang L, Zhang J. Tian S, et al. Among authors: liu n. J Infect. 2020 Apr;80(4):401-406. doi: 10.1016/j.jinf.2020.02.018. Epub 2020 Feb 27. J Infect. 2020. PMID: 32112886 Free PMC article.
1,872 results