Corrections
Biases in electronic health record data due to processes within the healthcare system: retrospective observational study
BMJ 2018; 363 doi: https://doi.org/10.1136/bmj.k4416 (Published 18 October 2018) Cite this as: BMJ 2018;363:k4416
In figure 3b of this paper (BMJ 2018;361:k1479, doi:10.1136/bmj.k1479), which also appeared in the print issue of 5 May 2018, the y axis range should have read 0.6 to 1.0.