Nature Biomedical Engineering https://doi.org/10.1038/s41551-017-0115-8 (2017); published online 24 July 2017; corrected online 2 August 2017.

In the version of the Supplementary Information originally published, in Supplementary Fig. 8a, in the bottom row, the left-most image (‘Control’) was not the correct image; this has now been replaced.