Funding for this research was provided by:
British Geological Survey
University of Nottingham School of Health Sciences
Text and Data Mining valid from 2018-07-16
Received: 21 July 2016
Accepted: 19 June 2018
First Online: 16 July 2018
Ethics approval and consent to participate
: The collection of data for The Health Improvement Network database (THIN) was approved by the South West Research Ethics Committee (reference number 07/H1102/103). Separate REC approval is not required for postcode linkages to geographic data sources. The linkage between THIN and the Geochemical Baseline Survey of the Environment was internally approved by IQVIA (the providers of the THIN database) and the British Geological Survey.
: Not applicable
: The authors declare that they have no competing interests.
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