Selection of Studies
Two reviewers independently searched the literature using the
predetermined search criteria and strategy. Subsequently, the reviewers
also independently determined the trials for inclusion in the
meta-analysis. Any conflict in the process were resolved by another
reviewer. The flow of selection of studies was shown using the Preferred
Reporting Items for Systematic Reviews and Meta-analyses (PRISMA)
diagram. For articles that were not in English language, the authors of
the studies in question were contacted for English language-translated
copies, if available. English language-translated copies of the studies
were in the systematic review.