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ncbi.nlm.nih.gov

National center for biotechnology information

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Ncbi.nlm.nih.gov has first positions for keywords

Pos.KeywordResultsLast check
10
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4.64 MillionJan 17st, 2019
10
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1.81 MillionJun 25st, 2017
10
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1.45 MillionNov 23st, 2018
10
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1.88 MillionDec 12st, 2018
11
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6.81 MillionJun 27st, 2017
141
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41.5 MillionJun 22st, 2018
135
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1.95 MillionJun 23st, 2017
14
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20.8 MillionJun 9st, 2018
17
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218 MillionAug 21st, 2017
11
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430 MillionNov 24st, 2018

Best keywords in 2-5 positions

Pos.KeywordResultsLast check
23
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2.09 MillionJan 16st, 2019
20
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20.8 MillionJan 18st, 2019
211
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1.15 MillionNov 10st, 2017
2-1
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3.34 MillionJan 28st, 2016
20
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1.32 BillionDec 21st, 2018
2-1
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1.01 MillionFeb 9st, 2018
27
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1.45 MillionDec 29st, 2017
20
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2.28 MillionMay 14st, 2018
24
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7.03 BillionDec 29st, 2018
230
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36.8 MillionOct 26st, 2018

Best keywords in 6-10 positions

Pos.KeywordResultsLast check
6-2
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402 MillionFeb 16st, 2016
60
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7.19 MillionOct 25st, 2017
60
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2.64 MillionJan 28st, 2018
60
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482 MillionDec 8st, 2018
62
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5.85 MillionJan 22st, 2018
611
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2.11 BillionJan 12st, 2019
60
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24.9 MillionJun 22st, 2017
617
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44.9 MillionJun 29st, 2017
62
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142 MillionJun 29st, 2017
6-3
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17 MillionJun 20st, 2018