First author, year (references) | Selection | Comparability | Exposure | Score |
---|---|---|---|---|
Gui, CY 2018 [15] | ☆☆☆ | ☆ | ☆☆☆ | 7 stars |
Zhou, YL 2012 [9] | ☆☆☆ | ☆☆ | ☆☆☆ | 8 stars |
Yuan, J 2017 [10] | ☆☆☆ | ☆☆ | ☆☆☆ | 8 stars |
Kim, BY 2012 [16] | ☆☆☆ | ☆☆ | ☆☆☆ | 8 stars |
Park, JP 2014 [17] | ☆☆☆ | ☆ | ☆☆☆ | 7 stars |
Zhang, LY 2015 [11] | ☆☆☆ | ☆ | ☆☆☆ | 7 stars |
Xu, D 2014 [18] | ☆☆☆ | ☆ | ☆☆☆ | 7 stars |
So, YK 2010 [19] | ☆☆☆ | ☆☆ | ☆☆☆ | 8 stars |
Caliskan, M 2012 [20] | ☆☆☆ | ☆ | ☆☆☆ | 7 stars |
Zhang, Q 2019 [21] | ☆☆☆ | ☆ | ☆☆☆ | 7 stars |
Feng, JW 2020 [22] | ☆☆☆ | ☆ | ☆☆☆ | 7 stars |
Zhang, C 2020 [23] | ☆☆☆ | ☆☆ | ☆☆☆ | 8 stars |
Liu, C 2021 [12] | ☆☆☆ | ☆ | ☆☆☆ | 7 stars |