[1] Univ Hosp Ribeirao Preto, Ribeirao Preto, Brazil
[2] Pio XII Fdn, Barretos, Brazil
[3] Santa Casa Misericordia, Sao Paulo, Brazil
[4] Univ Estadual Campinas, Campinas, SP, Brazil
[5] Amaral Carvalho Fdn, Jau, Brazil
[6] Univ Sao Paulo, BR-14049 Ribeirao Preto, Brazil