1. Assessing health status and quality of life of cancer patients: the use of general instruments;Erickson,2005
2. Interpreting quality of life in individuals and groups: meaningful differences;Osoba,2005
3. Hi! How are you? Response shift, implicit theories and differing epistemologies;Norman;Qual Life Res,2003
4. Adaptation to changing health: response shift in quality-of-life research;Schwartz,2000
5. Statistical power analysis for the behavioural sciences;Cohen,1988