Correction to: Nature Medicine https://doi.org/10.1038/s41591-018-0087-6, published online 2 July 2018.

In the version of this article originally published, a grant was omitted from the Acknowledgements section. The following sentence should have been included: “R.B.M. was supported by a Department of Veterans Affairs Merit Award (5I01BX003272).” The error has been corrected in the HTML and PDF versions of this article.