“…Prigerson has focused attention on the persistence of a specific set of symptoms related to pain about the loss and to significant impairment of physical and mental health for at least six months (Lai et al, 2014a;Prigerson et al, 1995). There is a discrete overlap in the description of the two nomenclature, such as difficulty of adaptation, inability to move forward with lives, difficulty to fulfil responsibilities, somatic symptoms and disinterest in establishing new relationships (Horowitz et al, 1993(Horowitz et al, , 1997Lai et al, 2014a,b;Lombardo et al, 2012Lombardo et al, , 2014. However, there are also some specific differences between the two nomenclature: Prigerson considered the ''separation distress'' and the ''presence of dysfunctioning'' as essential criteria for the diagnosis of prolonged grief disorder including ''loneliness'' and ''emotional (Chiambretto et al, 2008;Prigerson et al, 2008), while Horowitz considered ''sleep disorders'' (Horowitz et al, 1997).…”