“…Meanwhile, evidence on the impact of MMT on health utility (preference-based HRQOL), an integral part of the quality-adjusted life years, is still very limited (Feeny, 2000). Moreover, in a systematic review of 22 economic evaluations of MMT, the author found no studies investigating the changes in healthcare service utilization and out-of-pocket (OOP) health expenditure in the presence of MMT (Alistar, Owens, & Brandeau, 2011;Barnett, 1999aBarnett, , 1999bBarnett & Hui, 2000;Barnett, Zaric, & Brandeau, 2001;Dijkgraaf et al, 2005;Doran, 2005;Doran et al, 2003;French, 2001;Hartz et al, 1999;Masson et al, 2004;Mojtabai & Zivin, 2003;Negrin & Vazquez-Polo, 2006;Shanahan et al, 2006;Sindelar, Olmstead, & Peirce, 2007;Tran et al, 2012bVanagas, Padaiga, & Bagdonas, 2010;Wammes et al, 2012;Warren et al, 2006;Xing et al, 2012;Zaric, Barnett, & Brandeau, 2000).…”