Quality Assessment of Trials Comparing Add-On Devices With Standard Colonoscopy

We appreciate the interest shown by Zhang et al1 for our study and we thank them for their letter, which points out some aspects in our paper that evidently need further explanation. They are absolutely right in highlighting the substantial difference in quality assessment between studies published only as abstracts and those published as full-text papers, but this issue is widely addressed in Supplementary Figure 1 of our meta-analysis where conference abstracts were rated at high risk of "other bias" (seventh item of the Cochrane tool for assessing the risk of bias).

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