Article History
Accepted: 31 March 2017
First Online: 2 May 2017
Compliance with ethical standards
:
: The project was funded by University of Copenhagen, Denmark and National Veterinary Institute, Technical University of Denmark. The funding source had no involvement in the experimental design, analysis and interpretation of the results.
: The authors declare that they have no conflict of interest.
: All applicable international, national and/or institutional guidelines for the care and use of animals were followed. The experimental procedure was approved by the Danish Animal Inspectorate (2013–15–2934 − 00849).This article does not contain any studies with human participants performed by any of the authors.