The authors wish to acknowledge the students and universities who participated in this study. In addition we wish to acknowledge the UK Student Health Group (J. John, P. Deeny, C. Phillips, S. Snelgrove, H. Adetunji, X. Hu, S. Parke, M. Stoate, A. Mabhala). We also thank the anonymous reviewers for their constructive comments that helped strengthen the article.