Patients
Patient interviews were conducted via telephone, as they took place during the COVID-19 pandemic in the second and third years of implementation. A semi-structured interview guideline was developed with the key topics ‘from diagnosis to participation in isPO’, ‘assessment of the care programme’, and ‘overall assessment’ (the key questions for all interview guidelines can be found in Online Resource 1). Four evaluators conducted the interviews, each responsible for one respective care network.