Analysis of interview data
The recorded interviews were professionally transcribed verbatim. Analysis of the pilot interviews is described elsewhere [Briefly, researchers with qualitative research experience will independently familiarise themselves with the interview data by listening to the audio-recordings and reading and re-reading the transcribed data. Following this, the qualitative research team will independently code the first three interviews. A combined deductive and inductive approach to coding will be taken. This will allow themes and codes to be pre-determined based on the domains of the RE-AIM framework, which aligns directly to the aims of the trial, but also ensures unexpected codes and themes can be constructed directly from the participants’ accounts and experiences. The team will meet to discuss and refine these initial codes, culminating in an agreed working analytical framework that will then be systematically applied to the remaining transcripts. Throughout this stage the research team will meet regularly to review and refine the framework as indicated. NVivo (QSR International) software will be used to manage the qualitative data and facilitate these initial stages of analysis. Following the application of the analytic framework, data will be charted into a matrix, which will summarise the data from each participant by theme. This stage will be managed using Excel software (Microsoft Ltd). The developed matrices will be discussed with the qualitative research team, before being used to interpret the data by comparing data both across and within cases.All members of the qualitative research team will keep a reflexive diary in which they will reflect upon how their backgrounds, experiences, and knowledge may influence the qualitative research process and the interpretation of the data [