Linden, S. van der

health patient state utility health state quality marker state value measurement measure activity health states effect marker alternative comparison rating scale utility measurement gamble disease intervention dimension level life years method rating scale questionnaire instrument outcome utility measures alternative b chance torrance health care interventions assessment maastricht leisure activities time trade-off preference leisure treatment arthritis problem number probability self-care trial death journal approach decision rheumatology marker states utility values status performance technology assessment spondyliti mobility difficulty ankylosing spondylitis world health organization ankylosing patient utility measurement gamble technique side effects outcome measure sickness impact profile improvement trade-off rating scale method order description technology question change feeny gafni weight