[1] Univ Sao Paulo, Ribeirao Preto Med Sch, Dept Internal Med, Div Hematol, BR-14049 Ribeirao Preto, Brazil
[2] Univ Fed Ceara, Fortaleza, Ceara, Brazil
[3] Univ Sao Paulo, BR-14049 Ribeirao Preto, Brazil
[4] Univ Sao Paulo, Dept Internal Med, Ribeirao Preto Med Sch, BR-14049 Ribeirao Preto, Brazil
[5] Univ Sao Paulo, BR-14049 Ribeirao Preto, Brazil
[6] Univ Sao Paulo, Med Sch Ribeirao Preto, Internal Med, BR-14049 Ribeirao Preto, Brazil
[7] Univ Sao Paulo, Dept Internal Med, Ribeirao Preto Med Sch, BR-14049 Ribeirao Preto, Brazil