Funding for this research was provided by:
Vetenskapsrådet (2014-7196)
Västerbotten Läns Landsting
Norrbottens Läns Landsting
Article History
Received: 23 November 2018
Accepted: 22 January 2019
First Online: 8 February 2019
Compliance with ethical standards
:
: The authors declare that there is no conflict of interest regarding the publication of this paper. Any underlying research material can be accessed after contact with the corresponding author.
: This study was approved by the Regional Board of Ethics (reference numbers: 2009/227-31/3 and 2012/1775-32) at the Karolinska Institute, Stockholm.
: All procedures performed in the study were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. All experiments in the study complied with current law in Sweden.
: Individual informed consent was obtained from all participants included in the study. The study was registered at ClinicalTrials.gov (ID NCT01413412).