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McKenzie, L; Cairns, J; Osman, L; (2001) Symptom-based outcome measures for asthma: the use of discrete choice methods to assess patient preferences. Health policy (Amsterdam, Netherlands), 57 (3). pp. 193-204. ISSN 0168-8510 https://researchonline.lshtm.ac.uk/id/eprint/14502 Full text not available from this repository.