„The relationship between mental health and PIU (Anm.: PIU = Problematic Internet Use) appears to be bi-directional, as although poor mental health can be a strong precursor to PIU, studies have also found that PIU can predict poor mental health.“
Univ.-Prof. Dr. Emma Louise Anderson u. a., „Internet use and Problematic Internet Use“. In: „International Journal of Adolescence and Youth“, Vol. 22, 2017, S. 446