Funding for this research was provided by:
Aase og Ejnar Danielsens Fond
Det Obelske Familiefond
Received: 15 January 2020
Accepted: 19 March 2020
First Online: 8 April 2020
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Due to the retrospective nature of the study, no formal approval from the ethics committee was required according to our national legislation. The study was approved by the Danish Data Protection Agency (approval number 2008-58-0028).
: Not applicable
: The authors declare that they have no competing interests.