Funding for this research was provided by:
National Institute for Health Research (IS-HPU-1112-10117)
Text and Data Mining valid from 2019-08-15
Received: 22 March 2019
Accepted: 27 June 2019
First Online: 15 August 2019
Ethics approval and consent to participate
: No ethical approval was required as these data were collected for public health surveillance under The Health Protection Legislation (England) Guidance 2010 [CitationRef removed]. Hospital Episode Statistics (HES) data were made available by NHS Digital (Copyright 2015, re-used with the permission of NHS Digital. All rights reserved.) Approvals for the use of anonymised HES data were obtained as part of the standard NHS Digital data access process. Patient Episode Database for Wales (PEDW) data were made available by NHS Wales Informatics Service. Approvals for the use of anonymised PEDW data were obtained as part of the standard NHS Wales Informatics Service data access process.
: Not applicable.
: The authors declare that they have no competing interests.