Elmelund, Marlene http://orcid.org/0000-0002-8110-9379
Biering-Sørensen, Fin
Bing, Mette Hornum
Klarskov, Niels
Article History
Received: 18 May 2018
Revised: 2 July 2018
Accepted: 2 July 2018
First Online: 10 August 2018
Compliance with ethical standards
:
: ME and NK have received paid travel expenses from Contura travel expenses from Contura and MB has received paid travel expenses from Normedi. FB-S has no conflicts of interest to disclose.