The list of included primary studies will be reviewed in order to identify overlapping studies considered in two or more eligible reviews. We will generate a citation matrix presenting all the included reviews and primary publications. We will estimate the overlap by calculating the corrected covered area (CCA), to assess if specific primary studies are overrepresented. CCA will reflect the degree of actual overlap, as it is not influenced by large reviews. Should high or very high overlap be detected, we will retain the review which will be (1) the most recent, (2) containing a higher amount of information, and (3) the most rigorous in terms of methodology, as assessed by ROBIS tool and GRADE scale. We will examine and record whether the results of overlapping studies are concordant, and if many relevant primary studies would be excluded as a result of the above approach .