Confirmation of the Three-Factor Model of Problematic Internet Use on Off-Line Adolescent and Adult Samples. - Beatrix Koronczai; Róbert Urbán; Gyöngyi Kökönyei; Borbála Paksi; Krisztina Papp; Bernadette Kun; Petra Arnold; János Kállai; Zsolt Demetrovics (Cyberpsychology Behav. Soc. Netw., 2011)