Additional file 1.
Discrete choice experiment in practice: a lay example. Discrete choice experiment, a form of conjoint analysis, allows not only a rank order of importance to be identified but also allows the distance between features, the degree of importance, to be measured. This very example was used in our study to introduce participants to the concept.
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Haughney et al. BMC Pulmonary Medicine 2007 7:16 doi:10.1186/1471-2466-7-16