Correction to: Nature Medicine https://doi.org/10.1038/s41591-019-0476-5, published online 06 June 2019.
In the version of this article originally published, there was an error in the Fig. 1c key. The label for the light blue color was “Time since last scan”. It should have been “Time to last scan”. The error has been corrected in the HTML and PDF versions of this article.