PMC:5332029 / 7327-7686 JSONTXT

{"project":"2_test","denotations":[{"id":"28249032-19621070-91797204","span":{"begin":145,"end":147},"obj":"19621070"}],"text":"This review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) Statement for Reporting Systematic Reviews [19] and additional guidelines for conducting and reporting systematic reviews [20]. The protocol was registered by the International Prospective Register of Systematic Reviews (registration number: CRD42016037305)."}