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Table 1 Table summarising the electronic information sources used. For a description of the abbreviations, see text

From: Systematic review of outcome domains and instruments used in clinical trials of tinnitus treatments in adults

Type of electronic search Database Number of items (n)
Academic databases PubMed 759
EMBASE 244
CINAHL 145
CENTRAL 560
Clinical trial registers ClinicalTrials.gov 141
ISRCTN 22
ICTRP 183
CDSR 23