Correction: Trials 23, 911 (2022)

https://doi.org/10.1186/s13063-022-06819-3

Following publication of the original article [1], we have been notified that the Competing section needs to be updated.

Originally published Competing interests section:

“The authors declare that they have no competing interests.”

Corrected Competing interests section:

“Dr J Snowden is currently a consultant with Pfizer. The authors confirm, however, that at the time of writing this paper, Dr Snowden did not engage in any commercial or promotional activity of any specific product. The protocol was written, revised, and approved prior to Dr. Snowden's engagement with Pfizer, and had no knowledge of this protocol's existence prior to its publication.”

The original article has been corrected.