Received: 2 November 2020
Accepted: 7 June 2021
First Online: 29 June 2021
: This study was conducted in accordance with the Helsinki Declaration for medical research and the Regional Ethics committee for Medical and Health Research in South-Eastern Norway approved the study (2011/1738a). Participation was based on written informed consent by the resident or next of kin if the resident was unable to provide consent.
: Not applicable.
: The authors declare that they have no competing interests.