PRISMA 2009 Flow Diagram

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 )

Eligibility

Included