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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1967
1
1968
2
1969
1
1970
1
1971
6
1972
1
1973
3
1974
74
1975
174
1976
184
1977
143
1978
203
1979
208
1980
209
1981
189
1982
201
1983
209
1984
191
1985
143
1986
151
1987
184
1988
189
1989
170
1990
175
1991
164
1992
162
1993
188
1994
124
1995
134
1996
157
1997
114
1998
109
1999
101
2000
139
2001
98
2002
117
2003
108
2004
105
2005
85
2006
130
2007
87
2008
91
2009
81
2010
97
2011
95
2012
87
2013
78
2014
56
2015
84
2016
64
2017
55
2018
39
2019
43
2020
47
2021
33
2022
12
2023
6
2024
14
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AMA
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Adaptive Clinical Trial
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Autobiography
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Clinical Conference
Clinical Study
Clinical Trial Protocol
Clinical Trial, Phase I
Clinical Trial, Phase II
Clinical Trial, Phase III
Clinical Trial, Phase IV
Clinical Trial, Veterinary
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Patient Education Handout
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Randomized Controlled Trial, Veterinary
Research Support, American Recovery and Reinvestment Act
Research Support, N.I.H., Extramural
Research Support, N.I.H., Intramural
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Research Support, U.S. Gov't
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