... All reviews synthesised journal articles, with 28.7% (n = 29) also including book chapters, grey literature, dissertations, websites, posters and conference proceedings. 19,23,30,31,34,[38][39][40]42,51,56,57,59,61,63,64,71,75,76,88,92,93,95,99,104,106,108,114,117 Of those that focused only on journal articles, multiple reviews limited inclusion to original research studies, thereby excluding commentaries, letters, editorials and review articles. ...