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This Data Model shows only the Primary and Foreign Keys.
A later version will be produced that will show all the Attributes in each Table.
  If you have any comments or suggestions please Email me
  We will also design a Data Mart which will be a natural starting-point for answering management Enquiries, producing Business Intelligence, Performance Reports and KPIs. 
  
 
This diagram shows a Top-Level View.
  There are Models for specific Subject Areas, as follows :-
Doctors and Practices
Patients
Invoices and Payments
Procedures
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