Kaplan RC, Tirschwell DL, Longstreth WT, Manolio TA, Heckbert SR, LeValley AJ, Lefkowitz D, El-Saed A, Psaty BM. Blood pressure level and outcomes in adults aged 65 and older with prior ischemic stroke. J Am Geriatr Soc. 2006  ;54(9):1309-16.