Funding for this research was provided by:
Medical Research Council (MC_UU_12019/1, MC_UU_12019/3, MC_UU_12019/4)
Wellcome Trust (WT107467)
Text and Data Mining valid from 2018-05-16
Received: 30 May 2017
Accepted: 30 April 2018
First Online: 16 May 2018
Ethics approval and consent to participate
: Ethical approval for the NSHD data collection at 68–69 years was obtained from the Queen Square Research Ethics Committee (14/LO/1073), and the Scotland A Research Ethics Committee (14/SS/1009). At each stage of data collection, written informed consent was provided by all participants.
: The authors declare that they have no competing interests.
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