Verdoodt, Freija
Kjaer, Susanne K
Dehlendorff, Christian
Friis, Søren
Article History
Received: 8 August 2017
Revised: 14 November 2017
Accepted: 15 November 2017
First Online: 9 January 2018
Change Date: 20 February 2018
Change Type: Update
Change Details: This paper was modified 12 months after initial publication to switch to Creative Commons licence terms, as noted at publication
Competing interests
: The authors declare no conflict of interest.