Norregaard, Kamilla
Andersson, Magnus
Nielsen, Peter Eigil
Brown, Stanley
Oddershede, Lene B
Article History
First Online: 21 August 2014
Change Date: 12 September 2014
Change Type: Erratum
Change Details: In the version of this article initially published, the source from which Figures 2, 4, 8 and 9 was adapted was not cited and credited correctly. The error has been corrected in the HTML and PDF versions of the article.
Competing interests
: The authors declare no competing financial interests.