“…The majority of studies evaluated methods or tools for supporting the tasks of title and abstract screening (n=42) [32, 35, 36, 38, 43-45, 47, 48, 51, 55, 58, 59, 63, 73, 79, 82-84, 86-90, 94-96, 100, 102, 105-108, 112-114, 117-120, 125, 127] or devising the search strategy and performing the search (n=24) [28, 34, 37, 39, 42, 52, 53, 56, 60, 64-66, 72, 81, 91-93, 98, 99, 104, 110, 121, 122, 126] (see Figure 2). For several steps of the SR process, only a few studies that evaluated methods or tools were identi ed: deduplication: n=6 [30,36,54,57,71,80], additional search: n=2 [33,97], update search: n=6 [36, 50,61,77,109,111], full-text selection: n=4 [85, 113,114,125], data extraction: n=11 [31,36,46,67,69,70,74,103,112,124,125]; critical appraisal: n=9, [26, 27,36,49,62,68,75,101,115], and combination of abbreviated methods/tools: n=6 [12,25,76,78,100,116] (see Figure 2). No studies were found for some steps of the SR...…”