Correction to: Trials 22, 506 (2021)

https://doi.org/10.1186/s13063-021-05421-3

Following the publication of the original article [1], we were notified of an error in Fig. 1, the embedded SPIRIT diagram. In the first horizontal blue box, the text should read: “Phase 1: Pre-operative treatment (4 weeks)”.

The original paper has been corrected.