Table 3 Quality assessment of included studies
Study | Selection | Comparability | Outcome | Total | Quality level |
|---|---|---|---|---|---|
Briganti 2012 | 3 | 2 | 3 | 8 | High |
Buscariollo 2017 | 3 | 2 | 3 | 8 | High |
Fossati 2016 | 3 | 1 | 3 | 7 | Moderate |
Hwang 2018 | 3 | 2 | 2 | 7 | Moderate |
Borghetti 2017 | 3 | 1 | 2 | 6 | Moderate |
Hervas 2017 | 3 | 0 | 3 | 6 | Moderate |
Mishra 2015 | 3 | 2 | 2 | 7 | Moderate |
Hsu 2015 | 3 | 2 | 3 | 8 | High |
Tilki 2016 | 3 | 2 | 3 | 8 | High |
Detti 2012 | 3 | 1 | 3 | 7 | Moderate |
Ost 2011 | 3 | 2 | 2 | 7 | Moderate |
Trabulsi 2008 | 3 | 2 | 2 | 7 | Moderate |
Tsien 2003 | 3 | 1 | 2 | 6 | Moderate |
Taylor 2003 | 3 | 1 | 2 | 6 | Moderate |
Kalapurakal 2002 | 3 | 1 | 1 | 5 | Moderate |