| Authors, year | Random sequence generation (selection bias) | Allocation concealment (selection bias) | Binding of participants and personnel (performance bias) | Blinding of outcome assessment (detecting bias) | Incomplete outcome data (attrition bias) | Selective reporting bias (reporting bias) | Other bias |
| Valizadeh, 2015 | U | U | H | U | L | L | H | Li, 2011 | L | U | H | H | L | L | U | Bakir, 2018 | U | U | U | U | L | L | H | Unal, 2016 | U | U | U | U | L | L | H | Zengin, 2018 | L | U | U | U | L | L | U | Rambod, 2019 | L | L | H | L | L | L | U | Malekshahi, 2018 | U | U | U | U | U | L | H | Oshvandi, 2014 | L | L | H | U | L | L | U | Samarehfekri, 2020 | L | L | U | U | L | L | U | Toygar, 2020 | L | U | L | L | L | L | U | Bahrami, 2019 | L | L | H | U | L | L | U | Noh et al., 2019 | L | U | H | U | L | L | U | Mahdavipour et al., 2019 | U | U | H | U | L | L | U | Soheili et al., 2017 | L | U | H | U | L | L | U | Vardanjani et al., 2013 | L | U | H | U | L | L | H | Bagheri-nesami et al., 2014 | L | U | U | U | L | L | U | Khaledifar et al., 2017 | U | U | U | U | L | L | H | Saatsaz et al., 2016 | L | U | H | U | L | L | H | Pasyar et al., 2018 | L | L | H | U | L | L | H | Koras et al., 2019 | U | U | H | U | L | L | H | Eguchi et al., 2016 | U | U | U | U | L | L | U | Ozturk et al., 2018 | L | U | H | U | L | L | U | Ramezanibadr et al., 2018 | L | U | H | U | L | L | U | Shahsavari et al., 2017 | L | U | H | U | L | L | U | Abbaszadeh et al., 2018 | L | L | U | L | L | L | U | Levy et al., 2020 | L | U | H | L | L | L | U |
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