Funding for this research was provided by:
National Institutes of Health (AG08724)
Vetenskapsrådet (2017-00641, 2015-03255, 2018-02077)
the Loo & Hans Osterman Foundation
the Foundation for Geriatric Diseases
the Magnus Bergwall Foundation
the Strategic Research Program in Epidemiology at Karolinska Institutet
China Scholarship Council
Received: 7 December 2018
Accepted: 29 April 2019
First Online: 15 May 2019
Ethics approval and consent to participate
: Data collection in SALT was approved by the Research Ethics Committee at Karolinska Institutet (Dnr 97-051 and 00-132) and the current study by the Regional Ethics Board in Stockholm (Dnr 2016/1888-31/1). Informed consent was obtained from all participants. Participants were informed in writing prior to the computer-assisted telephone interview, with information that their participation was voluntary and that they could interrupt their participation at any time. At the end of the interview, participants were asked whether they could be contacted again for complementary questions and whether the Twin Registry could contact their physician to obtain medical records. After the interview, a letter was sent out to each participant confirming that they had been informed, had participated, and whether they agreed to recontact and/or contact with their physician.
: Not applicable.
: The authors declare that they have no competing interests.
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