“…To our knowledge, this study is the first to analyse a large sample social isolation cases in our society in terms of the global characteristics and the evolution and response to long-term treatment, thereby providing more scientific evidence about the phenomenon in Western culture. The results of this study confirm that the phenomenon exists in cultures other than in Japan (Aguglia et al, 2010;De Michele et al, 2013;Furuhashi et al, 2012;García-Campayo et al, 2007;Gariup et al, 2008;Gondim et al, 2017;Kato et al, 2012;Kondo et al, 2013;Lee et al, 2013;Malagón-Amor et al, 2015;Ovejero et al, 2014;Sakamoto et al, 2005;Teo, 2013;Wong et al, 2017a). Only one case corresponded to primary hikikomori (Koyama et al, 2010;Teo and Gaw, 2010), although the subject did demonstrate behaviour compatible with internet addiction (Teo et al, 2015b) confirming our hypothesis that isolation behaviour is not a new diagnostic category but a serious syndrome common to different mental disorders (Malagón-Amor et al, 2015).…”