1) Brazier J, Fukuhara S, Roberts J, Kharroubi S, et al.: Estimating a preference-based index from the Japanese SF-36. J Clin Epidemiol, 24 : 1085-1088 (2009).
2) EuroQol Group : EuroQol ; A new facility for the measurement of health-related quality of life. Health Poticy, 16 : 199-208 (1990).