Correction to: Trials 22, 816 (2021)

https://doi.org/10.1186/s13063-021-05791-8

Following the publication of the original article [1], we were notified of the below affiliation corrections:

  • Nancy J. Butcher is affiliated to 4 & 5 instead of 6

  • Martin Offringa is affiliated to 2, 4 & 6 instead of only 6

  • Farah El Turk is affiliated to 3 & 10, instead of just 3

The original article has been corrected.