Received: 23 September 2018
Accepted: 12 September 2019
First Online: 16 October 2019
Ethics approval and consent to participate
: All participants provided signed informed consent and were informed that participation in the study was voluntary and that their consent to participate could be withdrawn at any time. Permission to collect, compute, and store the data was approved by the Norwegian Data Protection Official for Research.
: Our manuscript does not contain any individual person’s data.
: The authors declare that they have no competing interests.