Received: 28 January 2021
Accepted: 21 August 2021
First Online: 10 September 2021
: According to the Danish legislation, research questionnaire- and register-based studies do not need approval from neither ethical and scientific committees nor informed consent. The study was notified to and registered at The Danish Data Protection Agency. All data were de-identified and analysed anonymously.
: Not applicable.
: The authors declared that they have no competing interests.