4Hays RD, Anderson R, Revicki D. Psychometric considerations in evaluating health- related quality of life measures. Qual Life Res, 1993, 2: 441-449.
5WHO. Study protocol for the World Health Organization project to develop a Quality of Life assessment instrument (WHOQOL). Qual Life Res, 1003, 2: 153-159.
6Lansky LL, List MA, Lansky SB, et al. Toward the development of a play performance scale for children (PPSC).Cancer, 1985, 56 (7 Suppl): 1837-1840.
7Lansky SB, List MA, Lansky LL. The measurement of performance in childhood cancer patients. Cancer, 1987, 60:1651-1656.
8Feeny D, Furlong W, Barr RD, et al. A comprehensive multiattribute system for classifying the health status of survivors of childhood cancer. J Clin Oncol, 1992, 10: 923-928.