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Can mapping algorithms based on raw scores overestimate QALYs gained by treatment? A comparison of mappings between the Roland–Morris Disability Questionnaire and the EQ-5D-3L based on raw and Differenced Score Data
Madan, Jason.  PharmacoEconomics.  v. 35. no. 5.   2017-05. p. 549 - 559... issn: 1170-7690 .   

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