“…different countries participating at the same time in the construction of a new instrument) (Simeoni et al, 2007), and revealed sound psychometric properties (Petersen, Schmidt, Power, Bullinger, & The Disabkids Group, 2005;Simeoni et al, 2007;. The instrument clearly accomplished all the requirements to paediatric QL measures proposed by the WHO (1993), and complied with most suggested criteria to assess instrument developmental adequacy (Bruil & Detmar, 2005;Bullinger & Ravens-Sieberer, 1995;Wallander, Schmitt, & Koot, 2001).…”