Article History
Received: 5 December 2018
Accepted: 23 February 2019
First Online: 6 June 2019
Compliance with ethical standards
:
: Author B. Ø.: declares that se has no conflict of interest. Author H.B.: declares that se has no conflict of interest. Author H. A.: declares that se has no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the national research committee and with the 1964 Helsinki declaration and is later amendments or comparable ethical standards.
: Informed consent was obtained from all participants included in the study.