Figure 1From: Protocol for Birmingham Atrial Fibrillation Treatment of the Aged study (BAFTA): a randomised controlled trial of warfarin versus aspirin for stroke prevention in the management of atrial fibrillation in an elderly primary care population [ISRCTN89345269] Summary of trial design. Incident case group: patient presents with atrial fibrillation to GP; Case note review group: patient is identified through GP computer system; Opportunistic screening group: patient is identified through opportunistic taking of pulse.Back to article page