Correction to: Nature Biotechnology https://doi.org/10.1038/s41587-020-00788-1, published online 11 January 2021.

In the version of this article initially published, as a result of an editing error, we said that Spinraza (nusinersen) “requires a child to be pulled from school for a month beforehand to prevent any illness that would render the necessary anesthesia unsuitable for the child.” We should have said that “as this requires anesthesia, reports have circulated that some parents have elected to pull their children from school for a month beforehand to prevent any illness that might compromise the procedure.” The error has been corrected in the PDF and HTML versions of the article.