The most popular databases.
Tenopir
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School of Library and Information Studies, University of Hawaii, Manoa.
D003258:Consumer Behavior / Q000706:statistics & numerical data*; D003625:Data Collection; D016206:Databases, Bibliographic / Q000706:statistics & numerical data*; D007990:Libraries / Q000706:statistics & numerical data*; D016239:MEDLINE / Q000706:statistics & numerical data; D014481:United States