Midland Research Practices Network (MidReC). Warfarin versus aspirin for stroke prevention in an elderly community population with atrial fibrillation (the Birmingham Atrial Fibrillation Treatment of the Aged Study, BAFTA): a randomised controlled trial - Mant, J; Hobbs, FD; Fletcher, K; BAFTA investigators (Lancet, 2007)
et al.