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Fig. 2 | BMC Medical Research Methodology

Fig. 2

From: Using the Cochrane Central Register of Controlled Trials to identify clinical trial registration is insufficient: a cross-sectional study

Fig. 2

Search strategy for identification of registration records. Abbreviations: CENTRAL, Cochrane Central Register of Controlled Trials; ICTRP, International Clinical Trials Registry Platform; ID, Identifier. a The number of ICTRP or ClinicalTrials.gov records in CENTRAL was estimated by limiting the publication year up to and including 2019

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BMC Medical Research Methodology

ISSN: 1471-2288

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