Hellström C., Nilsson K. W., Leppert J., and Cecilia Åslund C. Åsund. “Effects of Adolescent Online Gaming Time and Motives on Depressive, Musculoskeletal, and Psychosomatic Symptoms”. Upsala Journal of Medical Sciences, vol. 120, no. 4, June 2015, doi:10.3109/03009734.2015.1049724.