Descriptive numerical analysis
The initial search included all studies published before December 2019, which is when the online searches were executed. As outlined in Fig. 1, a total of 831 articles were initially retrieved through the database search. Six additional studies were identified through cross-references and hand searching. Of those, 32 articles were retrieved for full-text review and 14 were eventually retained for the final analysis. The two study designs employed were randomized control trials (RCT, 71%) and quasi-experimental designs with pre-/post-study assessments (29%). A summary if the studies included in this review is presented in Table 1.