Funding for this research was provided by:
Stiftelsen Konung Gustaf V:s Jubileumsfond
Västerbotten Läns Landsting (RV-837561, RV-839771)
Text and Data Mining valid from 2019-12-01
Received: 1 June 2019
Accepted: 22 November 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: All the patients and controls provided written informed consent to participate in the study, and the study was approved by the Regional Ethical Review Board Umeå, Sweden, and has been performed in accordance with the Declaration of Helsinki.
: Not applicable
: The authors declare that they have no competing interests.