Received: 10 September 2019
Accepted: 23 April 2020
First Online: 14 May 2020
Ethics approval and consent to participate
: Before participation the patients were informed of the project and its purpose, both verbally and in writing. Response to the questionnaires constituted voluntary consent to participation; this applied for both baseline and follow-up. The study was approved by the Danish Data Protection Agency (2008-58-0020), and thus required no further ethical approval, according to Danish legislation (16–000014).
: Not applicable.
: The authors report no conflicts of interest.