5156 | Teleman, 2004 | 2 | 20 | 0 | excluded | not a RCT | risk of bias not avaialble |
5157 | Wu, 2004 | 2 | 20 | 0 | excluded | not a RCT | risk of bias not avaialble |
5158 | Loeb, 2004 | 2 | 20 | 0 | excluded | not a RCT | risk of bias not avaialble |
5159 | Wilder-Smith, 2005 | 2 | 20 | 0 | excluded | not a RCT | risk of bias not avaialble |
5160 | Wang, 2020 | 2 | 20 | 0 | excluded | not a RCT | risk of bias not avaialble |
5161 | Cowling, 2008 | 0 | 3 | 0 | selection pending |
5162 | Cheng, 2010 | 2 | 20 | 0 | excluded | not a RCT | risk of bias not avaialble |
5163 | MacIntyre, 2011 | 1 | 3 | 0 | | | risk of bias not avaialble |
5164 | Jaeger, 2011 | 2 | 19 | 0 | excluded | not a RCT | risk of bias not avaialble |
5165 | Aiello, 2012 | 1 | 3 | 0 | | | risk of bias not avaialble |
5166 | Suess, 2012 | 1 | 3 | 0 | | | risk of bias not avaialble |
5167 | Chokephaibulkit, 2012 | 2 | 20 | 0 | excluded | not a RCT | risk of bias not avaialble |
5168 | Zhang, 2012 | 2 | 20 | 0 | excluded | not a RCT | risk of bias not avaialble |
5169 | Sung, 2016 | 2 | 13 | 0 | excluded | not a RCT | risk of bias not avaialble |
5170 | Zhang, 2017 | 2 | 20 | 0 | excluded | not a RCT | risk of bias not avaialble |
5171 | Barasheed, 2014 | 1 | 1 | 0 | | | risk of bias not avaialble |
5172 | Ma, 2004 | 2 | 20 | 0 | excluded | not a RCT | risk of bias not avaialble |
5173 | Yin, 2004 | 2 | 20 | 0 | excluded | not a RCT | risk of bias not avaialble |
5174 | A EFFACER, 2013 | 0 | 0 | 0 | selection pending |
5175 | Cowling, 2009 | 1 | 1 | 0 | | | risk of bias not avaialble |
5176 | Zhang, 2013 | 2 | 13 | 0 | excluded | not a RCT | risk of bias not avaialble |
5177 | Nishiura, 2005 | 2 | 20 | 0 | excluded | not a RCT | risk of bias not avaialble |
5184 | Aiello, 2010 | 1 | 3 | 0 | | | risk of bias not avaialble |
5185 | Kim, 2012 | 0 | 0 | 0 | selection pending |
5186 | Lau, 2004 | 0 | 0 | 0 | selection pending |
5187 | Lau, 2004 | 0 | 0 | 0 | selection pending |
5188 | Uchida, 2017 | 0 | 0 | 0 | selection pending |
5189 | Wu, 2016 | 0 | 0 | 0 | selection pending |
5190 | Canini, 2010 | 1 | 3 | 0 | | | risk of bias not avaialble |
5191 | MacIntyre, 2009 | 1 | 1 | 0 | | | risk of bias not avaialble |
5192 | MacIntyre, 2016 | 1 | 3 | 0 | | | risk of bias not avaialble |
5193 | Simmerman, 2011 | 1 | 3 | 0 | | | risk of bias not avaialble |
5195 | Al-Jasser, 2012 | 0 | 0 | 0 | selection pending |
5196 | Balaban, 2012 | 0 | 0 | 0 | selection pending |
5197 | Choudhry, 2006 | 0 | 0 | 0 | selection pending |
5198 | Deris, 2010 | 0 | 0 | 0 | selection pending |
5199 | Emamian, 2013 | 0 | 0 | 0 | selection pending |
5200 | Gautret, 2009 | 0 | 0 | 0 | selection pending |
5201 | Hashim, 2016 | 0 | 0 | 0 | selection pending |
5202 | Zein, 2002 | 0 | 0 | 0 | selection pending |
5203 | Shin, 2018 | 0 | 0 | 0 | selection pending |
5204 | Alfelali, 2019 | 1 | 3 | 0 | | | risk of bias not avaialble |
5205 | Jolie, 1998 | 0 | 0 | 0 | selection pending |
5206 | Sung, 2012 | 0 | 0 | 0 | selection pending |
5207 | Tahir, 2019 | 0 | 0 | 0 | selection pending |
5208 | Larson, 2010 | 1 | 3 | 0 | | | risk of bias not avaialble |
5252 | MacIntyre (medical mask), 2015 | 1 | 3 | 0 | | | risk of bias not avaialble |
5355 | Paranjpe, 2020 | 1 | 13 | 4 | | not a RCT | high risk of bias |
5441 | Ayerbe, 2020 | 1 | 13 | 0 | | not a RCT | risk of bias not avaialble |
5562 | Davoodi, 2020 | 0 | 1 | 3 | selection pending |
5891 | HEP-COVID, 2021 | 0 | 1 | 0 | selection pending |
5895 | X-COVID-19, 2021 | 0 | 1 | 0 | selection pending |
5967 | Gorenstein, 2020 | 0 | 0 | 0 | selection pending |
6283 | Lynn, 2020 | 0 | 13 | 0 | selection pending |
6364 | Denas, 2020 | 0 | 0 | 0 | selection pending |
6405 | Li [retracted], 2020 | 2 | 0 | 0 | excluded | | risk of bias not avaialble |
6448 | Ménager, 2020 | 0 | 0 | 0 | selection pending |