Received: 2 January 2020
Accepted: 17 June 2020
First Online: 6 July 2020
Ethics approval and consent to participate
: The Danish Data Protection Agency 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 01–144/01 31104). Participation was voluntary and in agreement with the Declaration of Helsinki. Written informed 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.