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2. Methods for the Economic Evaluation of Health Care Programmes;Drummond,2005
3. Measuring health state preferences and utilities: rating scale, time trade-off, and standard gamble techniques;Bennett,1996
4. Time trade-off: one methodology, different methods;Attema;Eur J Health Econ,2013
5. Quantifying quality of life for economic analysis: time out for time tradeoff;Arnesen;Med Humanit,2003