Funding for this research was provided by:
Høgskolen i Oslo og Akershus (130209)
Text and Data Mining valid from 2020-01-10
Received: 26 September 2019
Accepted: 3 December 2019
First Online: 10 January 2020
Compliance with ethical standards
: All procedures performed in the study involving human participants were in accordance with the ethical standards of national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study has been approved by The Regional Committee for Medical Research Ethics in South East Norway (Ref. 2014/2050).
: Written, informed consent was obtained from all individual participants included in the study.