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First Online: 3 June 2019

Ethics approval and consent to participate

: This study received ethical approval from University of Oxford Inter-Divisional Research Ethics Committee (IDREC), Reference Number SSD/CUREC1A/13–262. Participants signed an Informed Consent form after a member of the research team had fully explained the study requirements. The wearable cameras were encrypted and did not record sound or conversations. Participants were not permitted to keep copies of the images.

: Not applicable.

: The authors declare that they have no competing interests.

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