Correction to: Scientific Reports https://doi.org/10.1038/s41598-018-23297-3, published online 19 March 2018

In the original version of this Article, the error bars in graphs b and c of Figure 1 were omitted.

In addition, the ORCID ID for Mikael Johansson was omitted.

These errors have now been corrected in the HTML and PDF versions of the Article.