Funding for this research was provided by:
The Swedish Research Council FORTE (2006-1506, EpiLife Centre)
Text and Data Mining valid from 2018-12-06
Received: 1 June 2018
Accepted: 27 November 2018
First Online: 6 December 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This project was approved by the regional ethical review board, Umeå, Sweden.
: Informed consent was obtained from all participants in the study.