Petersen, Michael http://orcid.org/0000-0002-0997-7657
Madsen, Jeppe B.
Jørgensen, Thomas J. D. http://orcid.org/0000-0002-7149-316X
Trelle, Morten B. http://orcid.org/0000-0002-5220-4297
Article History
Received: 28 February 2017
Accepted: 12 June 2017
First Online: 26 July 2017
Competing Interests
: The authors declare that they have no competing interests.