Fig. 1From: Use of existing systematic reviews for evidence assessments in infectious disease prevention: a comparative case studyMethodological steps for identifying, assessing, and applying existing systematic reviews. Footnote: Step 4 comprises the following options: (i) using the included studies as a quality check for literature search, (ii) using the existing review to provide the body of included studies, (iii) using the data abstraction, risk of bias assessment, and/or analyses from existing systematic reviews, (iv) using the complete existing reviewBack to article page