Even when systematic reviews are identified, only a small proportion of those are relevant to public health. For example, one search strategy captured 41, 871 abstract titles across all research topics in public health but once screened, only 1, 356 were identified as being potentially relevant, of which only 207 reviews were actually deemed relevant to public health [16] . The majority of published systematic reviews pertain to clinical topics rather than public health [16] . Consequently, there are gaps at the systematic review level across the spectrum of public health practice [6, 17] .