One size does not fit all: Participants' experiences of the selfBACK app to support self-management of low back pain-a qualitative interview study.

"Declarations Ethics approval and consent to participateThe randomized controlled trial, which this qualitative evaluation was part of, was approved by the Danish Data Protection Agency and regional ethics committees in Denmark and Norway. All participants provided written informed consent before trial enrolment. Consent for publicationNot applicable. Competing interestsAll authors declare to have no competing interests. After ending the RCT study, selfBACK was licensed to the Norwegian University of Science and Technology’s Technology Transfer Office and a third party. The researchers do not have any personal financial benefits from working with the study. Competing interests All authors declare to have no competing interests. After ending the RCT study, selfBACK was licensed to the Norwegian University of Science and Technology’s Technology Transfer Office and a third party. The researchers do not have any personal financial benefits from working with the study."

"Funding selfBACK has received funding from the European Union Horizon 2020 research and innovation program under Grant Agreement No. 689043."

"The selfBACK trial, including the qualitative process evaluation, was registered with ClinicalTrials.gov (NCT03798288) and approved by national ethical committees in Denmark (S-20182000-24) and Norway (2017/923-6) []. All participants had signed written consent forms for participation in the trial. At the start of an interview, participants gave verbal re-consent after the interviewer reminded the participant about the voluntary nature of participation, their withdrawal rights, confidentiality issues, and data storage and protection. Participants were informed that interviews would be recorded before arranging the interview. No reimbursement for participation was given."