Erratum

After publication of this study [1], we discovered that the unit of measurement used to quantify changes in axonal morphology had been incorrectly labelled. Both the methods section ‘Purkinje cell axonal morphology’ and ‘Table 2 legend’ should read:- All axonal changes are expressed as either frequency per standardized unit length of the Purkinje cell layer (1 centimetre) or frequency per Purkinje cell.

Competing interests

The authors declare that they have no competing interests.