Funding for this research was provided by:
Economic and Social Research Council (ES/L007487/1)
Medical Research Council (MC_UU_12017/13, MC_UU_12017/15)
Chief Scientist Office (SPHSU13, SPHSU15)
Text and Data Mining valid from 2020-04-03
Received: 2 October 2018
Accepted: 18 February 2020
First Online: 3 April 2020
Ethics approval and consent to participate
: Approvals for this research were received from the Aberdeen Children of the 1950s study steering committee (project identifier ACONF046), the NHS Scotland Public Benefit and Privacy Panel for Health and Social Care Research (project identifier 1718-0208), and the Administrative Data Research Network research approvals panel (project identifier PROJ-143).
: Not applicable.
: The authors declare that they have no competing interests.