Received: 6 November 2019
Accepted: 31 May 2020
First Online: 12 June 2020
Ethics approval and consent to participate
: Ethical approval was obtained for the study from Bangor University’s Health Sciences and Medical Sciences Ethics Committee (2017–16210), the National Health Service (NHS) Research Ethics Committee (Reference 17/WA/0249), and Her Majesty’s Prison and Probation Service. Research and development approval was also granted by the Public Health Wales Research and Development Office. Consistent with our ethical approval, informed written consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.