Received: 19 May 2019
Accepted: 14 August 2020
First Online: 1 September 2020
Ethics approval and consent to participate
: Ethical approval for using the data was obtained from the hospital district’s ethics committee (17.02.2009 §67) and research approval was obtained from the medical director of the hospital district (02/2009).
: Not applicable.
: The authors declare that they have no competing interests.