Article History
Received: 23 April 2017
Revised: 16 October 2017
Accepted: 17 October 2017
First Online: 22 December 2017
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: The Regional Medical Ethical Committee (REK), Eastern Norway (REK number 2016/1110), approved the study. We certify that the study was performed in accordance with the Declaration of Helsinki and followed all applicable institutional and governmental regulations concerning the ethical use of human volunteers during the study course.