Funding for this research was provided by:
Economic and Social Research Council (ES/L007509/1)
Economic and Social Research Council (ES/S00744X/1)
Medical Research Council (MR/K023241/1)
Academy of Finland (312310)
Received: 22 May 2019
Accepted: 20 December 2019
First Online: 28 December 2019
Ethics approval and consent to participate
: Ethical approval was obtained from the Office for Research Ethics Committee Northern Ireland (ORECNI; Ref: 15/WM/0212), the Research Ethics Committee for the School of Medicine, Dentistry and Biomedical Sciences at Queen’s University Belfast (Ref: 14/54), and the Administrative Data Research Network (ADRN) Approvals Panel (Ref: 2014/008); and conform to the principles embodied in the 1964 Declaration of Helsinki and its later amendments.
: Not applicable.
: The authors declare that they have no competing interests.