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Fig. 2 also highlights that Obstetrics and Gynecology (n=36) was the only publication in our systematic review where more than 10 studies searched clinical trials registries. In the other five publications that were analyzed, the mean number of studies that included a search of clinical trials registries was 4.4. Of the 47 studies that searched clinical trials registries, 36 did not make a clear indication whether or not they obtained or used any data from the clinical trials registries. The remaining 11 systematic reviews obtained data from studies found on clinicaltrials.gov. However, no specific connections between the studies found in the trials registries and the data in the systematic reviews were ever established.    Of the 47 studies that searched clinical trials registries, 36 did not make a clear indication whether or not they obtained or used any data from the clinical trials registries. The other 11 systematic reviews obtained data from studies found on clinicaltrials.gov.