Received: 1 March 2019
Accepted: 23 September 2019
First Online: 24 October 2019
Ethics approval and consent to participate
: The Danish Data Protection Agency has approved the analysis of the study data (approval no.: 2001-54-0280; 2007-58-0015, 2012-58-0004, HEH-2015-045, I-suite 03741). The National Committee on Health Research Ethics approved the data collection (approval no.: VEK: H-KF 01–144/0131104). Participation was voluntary and in agreement with the Declaration of Helsinki. Written consent to participate in the fifth examination of the CCHS was obtained from the participants.
: Not applicable.
: The authors declare that they have no competing interests.