Qualitative interviews
PIS
RECRUITMENT
At least three months after randomisation, we sent a purposive sample of patients a PIS and invitation letter to take part in a qualitative interview. We followed this up by telephone or email to gain provisional consent and organise a mutually convenient time. Similarly, physiotherapists involved in the trial were approached at the end of recruitment. Interviews were conducted face-to-face, by telephone or video-conference via Microsoft Teams, at the participant's preference. We audio-recorded all interviews and asked participants to formally consent verbally after reading a consent form. Interview recordings were transcribed verbatim using an online service (