Funding for this research was provided by:
Knud og Edith Eriksens Mindefond
Received: 9 October 2018
Accepted: 31 May 2019
First Online: 14 June 2019
Ethics approval and consent to participate
: The study was a register-based study which did not involve any direct contact with the patients or access to patient files, thus no informed consent or ethical approval was required. The study was registered with the Danish Data Protection Agency (Project ID 18/35695).
: Not applicable.
: The authors declare that they have no competing interests.