Funding for this research was provided by:
Academy of Medical Sciences and Wellcome Trust (AMS_HOP001\1060)
Text and Data Mining valid from 2020-03-19
Received: 19 November 2019
Accepted: 6 February 2020
First Online: 19 March 2020
Ethics approval and consent to participate
: All data were anonymised by the data owners before being accessed by the research team. Approval was granted by the University of Southampton Faculty of Medicine Ethics Committee (ID 24433) and the Health Research Authority (HRA) (IRAS 242031).
: Not applicable.
: The authors declare that they have no competing interests.