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Table 2.

General information of the collected data set

IndicatorNumberIndicatorNumber
Records 27,971 Author keywords 44,263 
Authors 164,445 Keywords Plus 54,801 
Affiliations 17,160 WoS categories 211 
Countries 175 Journals 2,427 
IndicatorNumberIndicatorNumber
Records 27,971 Author keywords 44,263 
Authors 164,445 Keywords Plus 54,801 
Affiliations 17,160 WoS categories 211 
Countries 175 Journals 2,427 

Note: WoS categories were refined by Clarivate Analytics as “research areas” in early 2019, but we used the finer grained version of the WoS categories, given that the period of study ends in 2018; and the numbers provided above are all raw numbers prior to cleaning.

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