Received: 20 June 2019
Accepted: 22 November 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: The study was approved by the Regional Committee on Medical and Health Research Ethics (REK) (2014/654 REK South-East - 12.12.2017).
: Not applicable. The Regional Committee on Ethics (REK) gave in its approval of 12.12.2017 also an exemption regarding confidentiality of patient information (the Health Personnel Law; Duty of Privacy).
: The authors declare that they have no competing interests.