Funding for this research was provided by:
Helse Sør-Øst RHF (2016049, 2013087)
Text and Data Mining valid from 2019-04-02
Received: 23 January 2019
Accepted: 22 March 2019
First Online: 2 April 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The founding organizations had no role in the design or conduct of the study; in the collection, analysis, or interpretation of data; or in the preparation, review, or approval of the manuscript.