ALF	Anonymised Linking Field
CAPI	Computer Assisted Personal Interview
CASI	Computer Assisted Self Interviewing
CIs	Confidence Intervals
EHR	Electronic Health Record
GP	General Practitioner
ICD-10	International Classification of Diseases Tenth Revision
NHS	National Health Service
NPV	Negative Predicted Value
NSW	National Survey for Wales
NWIS	NHS Wales Informatics Service
PAF	Postcode Address File
PEDW	Patient Episode Database for Wales
PPV	Positive Predicted Value
SAIL	Secure Anonymised Information Linkage
SQL	Structured Query Language
WLGP	Welsh Longitudinal General Practice dataset
WDSD	Welsh Demographics Service Dataset
WHS	Welsh Health Survey