Funding for this research was provided by:
Norges Teknisk-Naturvitenskapelige Universitet (82403726)
Text and Data Mining valid from 2019-02-07
Accepted: 30 January 2019
First Online: 7 February 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The Regional Committee for Medical Research Ethics and the Norwegian Data Inspectorate Number: Rek Midt 4.2006.2856.
: Informed consent was obtained from all individual participants included in the study.