Correction to: Nature Communications https://doi.org/10.1038/s41467-017-01494-4; published online 16 November 2017.

The original version of this Article contained an error in the third sentence of the ‘Animal studies’ section of the Methods, which incorrectly read ‘The sheep anesthesia was initiated with ketamine (25 mg kg−1) and then maintained by continuous intravascular (IV) infusion of propofol (800 mg kg−1 h−1) during imaging.’ The correct version states ‘800 µg kg−1 h−1’ in place of ‘800 mg kg−1 h−1’. This has been corrected in both the PDF and HTML versions of the article.