Received: 10 June 2019
Accepted: 25 September 2019
First Online: 7 November 2019
Ethics approval and consent to participate
: According to the Central Denmark Region Regional committee on Health Research Ethics no ethical approval was needed (j.nr.: 1-10-72-4-17).The study was approved by the Danish Data Protection Agency (j.nr.: 1-16-02-703-18) and the National Board of Health (j.nr.: 3-3013-2049/1).
: Not relevant
: LK, TMH, JKP, LR and CB report no conflict of interests. KA and TPM have received funding from the Danish HEMS research foundation.