Pictorial representation of the results from the risk of bias analysis indicating low to moderate risk of bias presented in the studies 14 , 15 , 16 , 17 , 18 , 19 , 20 , 23 , 24 , 25 , 26 , 39 . The figure was generated with the online RobVis tool. Source Data files are available in the article repository on Figshare, https://doi.org/10.6084/m9.figshare.c.7066553 .
