1. Park MJ, Park GD, Lee YY, Oh JA. Smartphone use actual condition for research. Seoul: Kyung Hee Cyber University;2012.
4. American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. 5th ed. Washington, D.C.: American Psychiatric Association;2013.
5. Seo MJ, Choi TY, Woo J, Kim J, Lee J. A comparative study of smartphone and Internet addiction on adolescent psychopathology. J Korean Soc Biol Ther Psychiatry. 2013; 19:154–162.
6. Smetaniuk P. A preliminary investigation into the prevalence and prediction of problematic cell phone use. J Behav Addict. 2014; 3:41–53.
7. Seo CM, Lee JH, Choi TY, Kim J, Shin I, Woo J. Study for relations between smart-phone addiction level and Korea youth self report. J Korean Soc Biol Ther Psychiatry. 2012; 18:223–230.
8. Choi SW, Kim DJ, Choi JS, Ahn H, Choi EJ, Song WY, Kim S, Youn H. Comparison of risk and protective factors associated with smartphone addiction and Internet addiction. J Behav Addict. 2015; 4:308–314.
9. Lee H, Seo MJ, Choi TY. The effect of home-based daily journal writing in Korean adolescents with smartphone addiction. J Korean Med Sci. 2016; 31:764–769.
10. Lee YS, Lee DH, Kim EY, Kang SY, Kim RS, Choi YH, Yoon MJ. Parent Education Program Manual for Smartphone Addiction. Seoul: Korea Youth Counseling & Welfare Institute;2013.
11. Kim D, Lee Y, Lee J, Nam JK, Chung Y. Development of Korean smartphone addiction proneness scale for youth. PLoS One. 2014; 9:e97920.
13. Weiser EB. Gender differences in Internet use patterns and Internet application preferences: a two-sample comparison. Cyberpsychol Behav. 2004; 3:167–178.
14. Rees H, Noyes JM. Mobile telephones, computers, and the Internet: sex differences in adolescents' use and attitudes. Cyberpsychol Behav. 2007; 10:482–484.
15. Lee YJ, Lee SI, Lee AR, Bahn GH, Choi TY, Kim JY, Kim JH, Park EJ, Park JS, Bhang SY, et al. Attitudes of psychiatrists towards smartphone usage of children and adolescents. J Korean Neuropsychiatr Assoc. 2015; 54:556–563.
16. Kalivas PW, Volkow ND. The neural basis of addiction: a pathology of motivation and choice. Am J Psychiatry. 2005; 162:1403–1413.
17. Prochaska JO, DiClemente CC, Norcross JC. In search of how people change. Applications to addictive behaviors. Am Psychol. 1992; 47:1102–1114.
18. Han DH, Kim SM, Lee YS, Renshaw PF. The effect of family therapy on the changes in the severity of on-line game play and brain activity in adolescents with on-line game addiction. Psychiatry Res. 2012; 202:126–131.
19. Lee H, Choi TY. The psychosocial approaches of Internet/game addiction. J Korean Soc Biol Ther Psychiatry. 2015; 21:65–72.