“…The overall rate of disagreement was low; a third reviewer was requested for <5% of the screened articles. The majority of these articles (78%) were cohort studies, 5 23,44,53,65,71,74,80,81,83 systematic reviews (5%), 7,49,89,96,97 and controlled trials (5%). 22,28,48,55,91 The 5 systematic reviews performed analyses on 0 to 25 articles each.…”