Preferences for accessing sexual health services among middle-aged and older adults in the UK: a study protocol for a discrete choice experiment using mixed methods 由 Dan Wu, Clare Tanton, Hannah Kuper, Fern Terris-Prestholt, Thomas Shakespeare, Eneyi Kpokiri, Junead Khan, Emily Greaves, Jason J. Ong, Stephen W. Pan, Sophie Bowen, Tracey Jannaway, Joseph D. Tucker

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