1. NHS Digital Quality and Outcomes Framework (QOF) 2009/10 http://content.digital.nhs.uk/catalogue/PUB04431
2. NHS Digital Quality and Outcomes Framework (QOF), enhanced services and core contract extraction specifications (business rules) http://content.digital.nhs.uk/qof
3. NHS Digital National Diabetes Audit Report 1 Care Processes and Treatment Targets 2016-17 https://digital.nhs.uk/catalogue/PUB30142
4. NHS Digital National Diabetes Audit. 2015-16 Report 2a: Complications and Mortality (complications of diabetes) https://files.digital.nhs.uk/pdf/4/t/national_diabetes_audit__2015-16__report_2a.pdf
5. Estimating the current and future costs of Type 1 and Type 2 diabetes in the UK, including direct health costs and indirect societal and productivity costs;Hex;Diabet Med,2012