The authors regret an error in figure 3 “Box and whisker plot showing the relationship between mean Ki67 and Gleason grade group.” An incorrect figure was initially included, which did not show the relationship between mean Ki67 and Gleason grade group, and instead showed the relationship between mean Ki67 and local recurrence according to fractionation schedule.
The correct figure, which does show the relationship between mean Ki67 and Gleason grade group, is shown below. The authors apologize for any inconvenience caused.
