Table 2.
Risk of bias rating in individual studies.
| Study | Random Sequence Generation | Allocation Concealment | Selective Reporting | Blinding of Participants | Blinding of Outcome Assessment | Incomplete Outcome Data |
|---|---|---|---|---|---|---|
| Akram et al., 2016 [24] | ||||||
| Choi et al., 2021 [26] | ||||||
| Choo et al., 2019 [15] | ||||||
| Hoang et al., 2022 [13] | ||||||
| Jang et al., 2020 [16] | ||||||
| Kim et al., 2015 [4] | ||||||
| Kim et al., 2021 [3] | ||||||
| Lee et al., 2015 [5] | ||||||
| Lee et al., 2019 [19] | ||||||
| Mo et al., 2013 [27] | ||||||
| Park et al., 2013 [14] | ||||||
| Park et al., 2014 [28] | ||||||
| Park et al., 2016 [12] | ||||||
| Park et al., 2017 [25] | ||||||
| Park et al., 2019 [29] | ||||||
| Park et al., 2020 [21] |
Risk of bias rating: 
Low risk of bias; 
High risk of bias; 
Uncertain.