Sivertsen, B., Knapstad, M., Petrie, K., O'Connor, R., Lønning, K. & Hysing, M. 2022, 'Changes in mental health problems and suicidal behaviour in students and their associations with COVID-19-related restrictions in Norway: a national repeated cross-sectional analysis', BMJ Open, 12(2), article no: e057492. http://dx.doi.org/10.1136/bmjopen-2021-057492