Wickström, Ronny
Skiöld, Beatrice
Petersson, Gunnar
Stephansson, Olof
Altman, Maria https://orcid.org/0000-0001-8316-0154
Funding for this research was provided by:
Stockholms Läns Landsting (-, -)
Vetenskapsrådet (2013-2429)
Strategic research programme in Epidemiology (-)
Article History
Received: 7 December 2017
Accepted: 17 July 2018
First Online: 20 July 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest
: The authors have no financial relationships relevant to this article to disclose. There were no study sponsors that had any part in the study design; the collection, analysis, and interpretation of data; the writing of the report; or the decision to submit the paper for publication.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study formal consent is not required.