Funding for this research was provided by:
H2020 Marie Skłodowska-Curie Actions (744299)
Received: 2 November 2019
Accepted: 28 April 2020
First Online: 12 May 2020
Ethics approval and consent to participate
: Ethics approval for the BIG3 study was obtained from the regional ethical review board in Lund. The original application (no. 2011/371), as well as subsequent amendments (no. 2012/474, 2013/530, 2013/856, 2014/535, 2014/920, and 2018/173) have been approved. Participation in the study comprises a written informed consent, it is voluntary, and participants have the right to quit their participation at any time.
: Not applicable.
: The authors declare that they have no competing interests.