Outcomes
LBP
RECURRENCE, APPENDIX
For the outcomes related to LBP recurrence, participants are contacted monthly to complete an online questionnaire hosted on a REDCap (Research Electronic Data Capture) server. If the questionnaire is not completed following an email reminder, data is then collected via telephone by a research assistant blinded to group allocation, documented in a hard copy version (i.e. paper), then immediately entered in REDCap. An overview of outcomes, outcome measures, instruments and assessment time points appear in Additional file Appendix 