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

Year Number of Results
1964 2
1965 3
1969 1
1979 3
1981 7
1982 10
1983 7
1984 5
1985 8
1986 14
1987 24
1988 14
1989 15
1990 25
1991 16
1992 21
1993 39
1994 37
1995 36
1996 40
1997 42
1998 74
1999 70
2000 93
2001 72
2002 86
2003 91
2004 106
2005 194
2006 199
2007 227
2008 243
2009 316
2010 378
2011 470
2012 539
2013 653
2014 808
2015 844
2016 971
2017 1062
2018 1259
2019 1414
2020 1678
2021 744
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11,621 results
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Page 1
COVID-19: Coronavirus Vaccine Development Updates.
Zhao J, Zhao S, Ou J, Zhang J, Lan W, Guan W, Wu X, Yan Y, Zhao W, Wu J, Chodosh J, Zhang Q. Zhao J, et al. Among authors: yan y. Front Immunol. 2020 Dec 23;11:602256. doi: 10.3389/fimmu.2020.602256. eCollection 2020. Front Immunol. 2020. PMID: 33424848 Free PMC article. Review.
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