Article History
Accepted: 14 March 2019
First Online: 20 March 2019
Compliance with ethical standards
:
: The authors declare that they have no competing interest.
: All procedures performed were in accordance with the ethical standards of the national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The Regional Ethics Committee of the South-East Health Region, Norway, approved the study (REC 2015/1561).
: The family member participants provided written informed consent before inclusion. Data collection in the general population sample was anonymous, and replying to the survey was considered as an implied consent.