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Addictive Behaviors 39 (2014) 1839–1845 Contents lists available at ScienceDirect Addictive Behaviors Comorbidity of psychiatric disorders with Internet addiction in a clinical sample: The effect of personality, defense style and psychopathology Georgios Floros a,b,⁎, Konstantinos Siomos b, Ariadni Stogiannidou c, Ioannis Giouzepas a, Georgios Garyfallos a a 2nd Department of Psychiatry, School of Medicine, Aristotle University of Thessaloniki, Greece b Hellenic Association for the Study of Internet Addiction Disorder, Larissa, Greece c Department of Psychology, School of Philosophy, Aristotle University of Thessaloniki, Greece H I G H L I G H T S • High comorbidity of Internet Addiction Disorder (IAD) with Axis I and II disorders. • Temporal precedence of comorbid disorders or IAD is only established individually. • Comorbid psychopathology can further exacerbate the presentation of IAD. • A complete psychiatric evaluation is appropriate for cases of IAD. a r t i c l e i n f o a b s t r a c t Available online 8 August 2014 This study aims to contribute to the understanding of underlying causes for the development of Internet Addic- tion Disorder (IAD) and assess comorbidity with other mental disorders through the analysis of data from a clin- Keywords: ical sample of college students who presented for treatment of IAD. The clinical sample of our study has Internet addiction demonstrated a high percentage of comorbidity with Axis I and II disorders, while the temporal precedence of Comorbidity