Text and Data Mining valid from 2020-04-01
Received: 15 October 2019
Accepted: 13 January 2020
First Online: 1 April 2020
Ethics approval and consent to participate
: All participants were informed orally and in writing before giving their written informed consent to participate. All participants could withdraw from the study at any time without giving a reason. The study was approved by the local regional ethics committee (2016/1280 Sør-øst B) and conformed to the latest version of the Declaration of Helsinki.Name of the committee: Regional ethical committee South-East B, Norway.
: The authors declare that they have no competing interest.