Funding for this research was provided by:
Pig Levy Foundation
Received: 1 August 2018
Accepted: 31 October 2018
First Online: 1 December 2018
Ethics approval and consent to participate
: According to Danish legislation this type of study does not require ethical approval. A consent form was provided to the students prior to starting the study.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.