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Table 2 Electronic databases used for searching

From: What is the effect of phasing out long-chain per- and polyfluoroalkyl substances on the concentrations of perfluoroalkyl acids and their precursors in the environment? A systematic review protocol

Database Searched field No of hits 3) Date
ISI Web of Science1) topic 3938 (3891) 2014-05-13
Science Direct title, abstract and keywords 3272 (2869) 2014-05-13
Engineering Village2) subject/title/abstract 1217 (728) 2014-05-14
Scopus title, abstract and keywords 2502 (639) 2014-05-14
Academic search premier title/abstract/subject/keyword 851 (815) 2014-05-14
Wiley Online Library abstract or title or keywords 641 (548) 2014-05-14
Directory of Open Access Journals all fields 42 (39) 2014-05-14
  1. 1)Including Web of Science™ Core Collection, Medline® and SciELO Citation Index.
  2. 2)Including Geobase and Georef.
  3. 3)Values in parentheses indicate number of items remaining after removal of duplicates when all databases are combined.