Thirty-one quantitative, observational studies (39 papers) met the inclusion criteria. The total number of students that participated in the quantitative studies was 17,476, with studies ranging in size from 57 to 3706. Eighteen studies recruited student participants from only one university; five studies (10 publications) [28,29,30,31,32,33,34,35,36,37] included seven or more universities. Six studies (7 publications) [35,36,37,38,39,40,