Univ Fed Sao Paulo, Dept Neurol & Neurocirurgia, BR-04039000 Sao Paulo, BrazilUniv Fed Sao Paulo, Dept Med, BR-04039000 Sao Paulo, BrazilUniv Fed Sao Paulo, Dept Neurol & Neurocirurgia, BR-04039000 Sao Paulo, BrazilUniv Fed Sao Paulo, Dept Med, BR-04039000 Sao Paulo, BrazilWeb of Scienc