[1] Mass Gen Vasc Ctr, Wang Ambulatory Care Ctr, Stroke Serv, 55 Fruit St, 7th Floor, Suite 720, Boston, MA 02114 USA
[2] Harvard Med Sch, Mass Gen Hosp, Boston, MA USA
[3] Univ Fed Sao Paulo, Sao Paulo, SP, Brazil
[4] Albert Einstein Hosp, Sao Paulo, SP, Brazil