Warfarin Use Following Ischemic Stroke Among Medicare Patients with Atrial Fibrillation
Arch Int Med 158:2093-2100, Brass,L.A.,et al, 1998
Comparison of Carotid Endarterectomy Outcomes from Ransomized Trials & Medicare Administrative Databases
Arch Neurol 54:826-832, Stukenborg,G.J., 1997