Fig. 1

Participant recruitment, data collection and analysis processes. ^aPatients were recruited through purposive sampling: GPs that had participated in the SLS and who had indicated their intention to participate in the qualitative study identified SLS patients and sent them a patient-centred invitation letter (provided by the sponsor). ^bGPs and PMs were recruited through opportunistic sampling: the sponsor sent an invitation letter detailing the qualitative study objectives and information about the advisory boards to all GP sites that had participated in the SLS. ^cA single 1-h telephone interview was conducted with a PM who was unable to attend the PM advisory board; this interview was facilitated by an interview guide that had been developed based on the PM version of the advisory board slide set. ^dThe sample of GP practices contacted was selected to cover a broad range of socioeconomic spread within Salford surrounding areas. ^eAnalysis conducted using the ATLAS.ti software (v7.5). Abbreviations: GP, general practitioner; HCP, healthcare professional; PM, practice manager; RTI-HS, RTI Health Solutions; SLS, Salford Lung Studies