Zimmermann, Eckart
Fink, Gereon R.
Article History
Received: 10 March 2016
Accepted: 11 August 2016
First Online: 21 September 2016
Change Date: 24 October 2016
Change Type: Update
Change Details: The HTML version of this paper was updated shortly after publication, following a technical error that resulted in the links to the Supplementary videos being omitted. This has now been corrected in the HTML; the PDF version of the paper was correct from the time of publication.
Competing interests
: The authors declare no competing financial interests.