Correction to: Nature Medicine https://doi.org/10.1038/s41591-021-01264-2, published online 15 March 2021.

In the version of this article initially published, “more than one third” in the second sentence of the second paragraph in the first subsection (‘Fear of the known’) was incorrect. The correct proportion is ‘about 2.5%’. The error has been corrected in the HTML and PDF versions of the article.