Correction to: Nature Biotechnology https://doi.org/10.1038/s41587-019-0272-2, published online 2 October 2019.

In the version of this article initially published, an affiliation was omitted for author Seung Ah Lee: School of Electrical and Electronic Engineering, Yonsei University, Seoul, Republic of Korea. The error has been corrected in the HTML and PDF versions of the article.