Funding for this research was provided by:
The Rockwool Foundation
Received: 19 November 2019
Accepted: 16 March 2020
First Online: 24 March 2020
Ethics approval and consent to participate
: The study was approved by the Danish Data Protection Agency. According to Danish law (Act on Research Ethics Review of Health Research Projects), available at: ExternalRef removed, questionnaire and register-based studies require neither approval by ethical or scientific committees nor written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.