Received: 20 October 2020
Accepted: 14 April 2021
First Online: 26 April 2021
: The research project was approved by Regional Committee for Medical and Health Research Ethics (REK: reference 2014/1621/REK west). All participants in the MFT groups received verbal and written information regarding the research project and signed a consent form. They were also informed that they could withdraw from the study at any time. The data were treated confidentially and anonymised.
: Not applicable.
: The authors declare that they have no competing interests.