Records excluded(n=84) based on title/abstract with reasons: -Review articles: 13-Case reports/editorial: 11 -Unrelated topics: 40-No standard reference: 10 -Animal experiments: 4-Others: 6
Screening
Studies included in quantitative synthesis (meta-analysis)(n = 17 )
Identification
Full-text articles assessed for eligibility(n = 23 )
Records screened(n = 107 )
Records identified through database searching(n = 146 )
Records after duplicates removed(n = 107 )
Studies included in qualitative synthesis(n = 17 )
Additional records identified through other sources(n = 3 )
