Table 1 Search strategy

Embase® search query

1 orthodontic$ (75,005)

2 #1 AND (‘clinical trial’/de OR ‘controlled clinical trial’/de OR ‘prospective study’/de OR ‘randomized controlled trial’/de) AND ‘article’/it (3360)

3 #1 AND (‘clinical trial’/de OR ‘controlled clinical trial’/de OR ‘prospective study’/de OR ‘randomized controlled trial’/de) AND ‘article’/it AND ‘human’/de AND (2013:py OR 2014:py OR 2015:py OR 2016:py OR 2017:py) (1008)