The effect of changing transfusion practice on rates of perioperative stroke and moycardial infarction in patients undergoing carotid endarterectomy: a retrospective analysis of 1114 Mayo Clinic patients. - Waggoner,J.R.; Wass,C.T.; Polis,T.Z.; Faust,R.J.; Schroeder,D.R.; Offord,K.P.; Piepgras,D.G.; Joyner,M.J. (Mayo Clin Proc, 2001)