TABLE 2.
Quality assessment of included studies.
| Study | Q1a | Q2a | Q3a | Q4a | Q5a | Q6a | Q7a | Q8a | Q9a |
| Yan et al., 2012 (16) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Giletta et al., 2012 (17) | Yes | Unclear | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Di Pierro et al., 2012 (18) | Yes | Unclear | No | Yes | Yes | Yes | Yes | Yes | Unclear |
| Sornberger et al., 2012 (19) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Tang et al., 2013 (20) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Tormoen et al., 2013 (21) | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes |
| Cheung et al., 2013 (22) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Zetterqvist et al., 2013 (23) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Liang et al., 2014 (24) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Rodav et al., 2014 (25) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Unclear |
| Liang et al., 2014 (26) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Evren et al., 2014 (27) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Albores-Gallo et al., 2014 (28) | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Unclear |
| Claes et al., 2014 (29) | Yes | Unclear | Yes | Yes | Yes | Yes | Yes | Yes | Unclear |
| Claes et al., 2015 (30) | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Hanania et al., 2015 (31) | Yes | Unclear | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Kiekens et al., 2015 (32) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Gandhi et al., 2015 (33) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Calvete et al., 2015 (34) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Somer et al., 2015 (35) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Kim and Yu, 2017 (36) | Yes | Unclear | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Cimen et al., 2017 (37) | Yes | Unclear | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Liu et al., 2017 (38) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Lin et al., 2017 (39) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Ma et al., 2018 (40) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Jiang et al., 2018 (41) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Cui et al., 2018 (42) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Gandhi et al., 2018 (43) | Yes | Yes | Unclear | Yes | No | Yes | Yes | Yes | Unclear |
| Liu et al., 2018 (44) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Tang et al., 2018 (9) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Ren et al., 2018 (45) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Jiang et al., 2018 (46) | Unclear | Unclear | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Cao et al., 2019 (47) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Chen et al., 2019 (48) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Chen et al., 2019 (49) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Ma et al., 2019 (50) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Xu et al., 2019 (51) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Zhang and Zhang, 2019 (52) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Li et al., 2019 (53) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Gaspar et al., 2019 (54) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Hu et al., 2020 (55) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Hu et al., 2020 (56) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Jiang et al., 2020 (57) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Lin et al., 2020 (58) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Mao et al., 2020 (59) | Yes | Yes | Unclear | Yes | Yes | Yes | Yes | Yes | Yes |
| Pang and Wang, 2020 (60) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Wang et al., 2020 (61) | Yes | Yes | Unclear | Yes | Yes | Yes | Yes | Yes | Yes |
| Zhou et al., 2020 (62) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Liu et al., 2020 (63) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Tang et al., 2020 (64) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Gu et al., 2020 (65) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Buelens et al., 2020 (66) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Liang et al., 2021 (67) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Sun et al., 2021 (68) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Costa et al., 2021 (69) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Perez et al., 2021 (70) | Unclear | Unclear | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Madjar et al., 2021 (71) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes |
| Jeong and Kim, 2021 (72) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Lee et al., 2021 (73) | Unclear | Unclear | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Tang et al., 2021 (74) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Jiang et al., 2021 (75) | Unclear | Unclear | Unclear | Yes | Yes | Yes | Yes | Yes | Yes |
| Abbasian, 2021 (76) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
aQ1–Q9 based on the Joanna Briggs Institute Risk Assessment (15).