Correction to: Nature Nanotechnology https://doi.org/10.1038/s41565-018-0222-z, published online 13 August 2018.

In the version of this Article originally published, the affiliation for the author Francesca Santoro was incorrectly given; it should have been ‘Center for Advanced Biomaterials for Healthcare, Istituto Italiano di Tecnologia, Napoli, Italy’. This has now been corrected in all versions of the Article.