Received: 8 March 2021
Accepted: 17 May 2021
First Online: 20 July 2021
: Ethical approvals were granted by King’s College London Research Ethics Committee for the survey (LRS-17/18–5103 November 2017) and Prototype refinement (LRS-19/20–19447 June 2020). Ethical approvals were granted for the interviews by North West Greater Manchester Central Research Ethics Committee (19/NW/0148 February 2019). Study site approval was granted April 2019. All participants gave informed consent. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable. The manuscript does not contain any individual person’s data in any form.
: The authors declare that they have no competing interests.