Fig. 1From: Opportunities and obstacles in linking large health care registries: the primary secondary cancer care registry - breast cancerTitle: Linkage procedure. DOB = date of birth, Nivel PCD=Nivel Primary Care Database, PC = postal code, PSCCR = Primary Secondary Cancer Care Registry, TTP = trusted third party. Ovals represent the original database, rectangles represent data files that are sent between the parties, rounded rectangles represent steps of the processBack to article page