Text and Data Mining valid from 2019-04-29
Received: 13 July 2018
Accepted: 11 March 2019
First Online: 29 April 2019
Change Date: 16 May 2019
Change Type: Correction
Change Details: In the version of the article originally published, extra lines were displayed in Fig. 7. Fig. 7a contained a solid black line that extended into panel b, and Fig. 7c contained two extra scale bars on the left. These have been removed from the figure. The errors have been corrected in the HTML and PDF versions of the article.
: The authors declare no competing interests.