Randomised assignment

Deviations from the intended intervention

Missing outcome data

Measurement of the outcome

Selection of the reported result

Overall risk of bias

Balk (2009)Cheng (2017)Deng (2013)Du (2021)Li (2020)Li (2023)Enojiv (2019)Molassiotis (2012)Molassiotis (2013)Smith (2013)Molassiotis (2007)Lu (2012)Deng (2018)Hou (2017)Mao (2014)

tabelle