1. Validation of interval scaling; the sickness impact profile;Carter;Health Service Res,1976
2. A scale of evaluations of states of illness: Is there a social consensus?;Rosser;Int J Epidemiol,1978
3. The reliability, stability and generalisability of a health status index;Kaplan,1978
4. The utility of different health states as perceived by the general public;Sackett;J Chron Dis,1978
5. Describing health states: Methodologic issues in obtaining values for health states;Llewellyn-Thomas;Med Care,1984