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. 2019 Jan 7;9(1):e026323. doi: 10.1136/bmjopen-2018-026323

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© Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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Screenshots of the ‘Clara’ study app. Sidebar for navigation (left), chat-based interface with predefined answer options (middle) and questionnaire module for patient-reported outcomes (right).