Funding for this research was provided by:
Wellcome Trust (203930/B/16/Z)
Health Research Board (203930/B/16/Z)
Swedish Research Council (2018-00932)
Swedish Research Council (2009-1068)
Received: 26 August 2019
Accepted: 17 February 2020
First Online: 1 April 2020
Ethics approval and consent to participate
: All data were anonymised and non-identifiable. Merging of individual datasets was possible using a unique serial number (lpnr) derived from each participant’s identification number before the research team received the data [CitationRef removed]. Ethical approval was granted by the Swedish Ethical Review Authority in Stockholm (Regionala Etikprovningsnamnden Stockholm) (Dnr 2012/397-31/1) and by the Social Research and Ethics Committee, University College Cork (2019-109).
: It was not necessary to gain consent from individual participants for publication since anonymised data fall outside the remit of the European Union General Data Protection Regulation and Health Research Regulations 2018 (Ireland).
: The authors declare that they have no competing interests.