[1] Univ Fed Sao Paulo, EPM, Dept Neurol, BR-04023900 Sao Paulo, Brazil
[2] Univ Fed Sao Paulo, Dept Cardiol, Sao Paulo, Brazil
[3] Univ Fed Sao Paulo, Dept Cardiovasc Surg, Sao Paulo, Brazil
[4] Univ Fed Sao Paulo, Dept Anesthesiol, Sao Paulo, Brazil
[5] Univ Sao Paulo, Dept Neurol, BR-05508 Sao Paulo, Brazil