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Contributors MF and TY provided written contributions throughout the article and act as guarantors for the content of the manuscript.
Funding The writing of the article was part-funded by the National Institute for Health Research (NIHR) Applied Research Collaboration Yorkshire and Humber (NIHR ARC-YH). The views expressed are those of the author(s) and not necessarily those of the NIHR or the Department of Health and Social Care. The funding agreement ensured the authors’ independence in developing the purview of the manuscript, writing and publishing the manuscript.
Competing interests MF and TY are part funded by the National Institute for Health Research (NIHR) Applied Research Collaboration Yorkshire and Humber (NIHR ARC-YH). As part of the NIHR ARC-YH, we are exploring the potential to map from non-preference-based mental health focussed measures to preference-based measures which includes the Patient Health Questionnaire-9 (PHQ-9) to the EQ-5D three-level version (EQ-5D-3L) or EQ-5D five-level version (EQ-5D-5L).
Provenance and peer review Not commissioned; externally peer reviewed.
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