Funding for this research was provided by:
Familjen Kamprads Stiftelse
Knut och Alice Wallenbergs Stiftelse
Familjen Erling-Perssons Stiftelse
Forskningsrådet om Hälsa, Arbetsliv och Välfärd
Merit och Hans Rausings stiftelse
SRA grant from the Swedish Government
Received: 3 July 2017
Accepted: 29 January 2018
First Online: 14 February 2018
Ethics approval and consent to participate
: All participants signed informed consent forms, and the ethical review board of Karolinska Institutet approved the study (2010/958-31/1).
: All authors approved of the manuscript and consented to its publication.
: The authors declare that they have no competing interests.
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