Two authors (S.A.S., J.P.) independently reviewed abstracts of all
relevant studies yielded from the initial search. In cases of dis-agreement, a review of the full article was conducted and inclu-sion determined by a third reviewer (A.E.J.). The full article of each
study passing the relevance screen was independently reviewed for
eligibility by two authors (S.A.S., W.R.M.). In cases of disagree-ment, a third reviewer (A.E.J.) determined inclusion. Data abstrac-tion was performed using a standard data collection form for each
study identified for final inclusion. For articles that did not include
complete data for inclusion in the meta-analysis portion, corre-sponding authors were contacted for additional information