Quality control of included studies
| Study | Item 1 | Item 2 | Item 3 | Item 4 | Item 5 | Item 6 | Item 7 | Item 8 | Item 9 | Item 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Bráz et al., 2012 [22] | ✘ | ✔ | ✘ | ✘ | ✔ | ✘ | ✔ | ✔ | ? | ✔ |
| Bráz et al., 2015 [23] | ✘ | ✔ | ✘ | ✘ | ✘ | ✘ | ✔ | ✔ | ? | ✔ |
| Eaton et al., 1999 [25] | ✘ | ✔ | ✘ | ✘ | ✘ | ✘ | ✘ | ? | ? | ✔ |
| Eaton et al., 2012 [24] | ✘ | ✘ | ✘ | ✘ | ✘ | ✘ | ✔ | ✔ | ? | ✔ |
| Etlin et al., 2016 [26] | ✘ | ✔ | ✘ | ✘ | ✘ | ✘ | ✔ | ? | ? | ✔ |
| Hwang et al., 2016 [16] | ✔ | ✘ | ✘ | ✘ | ✘ | ✘ | ✔ | ✔ | ? | ✔ |
| Jergova et al., 2012 [27] | ✘ | ✔ | ✘ | ✘ | ✘ | ✘ | ✔ | ? | ? | ✔ |
| Jergova et al., 2016 [15] | ✘ | ✔ | ✘ | ✘ | ✘ | ✘ | ✔ | ✔ | ? | ✔ |
| Juarez-Salinas et al., 2019 [28] | ✘ | ✔ | ✘ | ✘ | ✘ | ✘ | ✔ | ? | ? | ✔ |
| Kim et al., 2010 [29] | ✘ | ✔ | ✔ | ✘ | ✔ | ✘ | ✔ | ✔ | ? | ✔ |
| Manion et al., 2020 [32] | ✔ | ✔ | ✔ | ✔ | ✔ | ✘ | ✔ | ✔ | ? | ✔ |
| Mukhida et al., 2007 [30] | ✔ | ✔ | ✘ | ✘ | ✔ | ✘ | ✔ | ? | ? | ✔ |
| Vaysse et al., 2011 [31] | ✔ | ✔ | ✘ | ✘ | ✘ | ✘ | ✘ | ✔ | ? | ✔ |
Item 1: sequence generation, Item 2: baseline characteristics, Item 3: allocation concealment, Item 4: random housing, Item 5: caregivers and/or investigators blinding, Item 6: random outcome assessment, Item 7: outcome assessor blinding, Item 8: incomplete outcome data, Item 9: selective outcome reporting, Item 10: other sources of bias, ✔: low risk of bias, ✘: high risk of bias, ?: unclear risk of bias.