1 Setor Universitário, Goiânia, 74605-050, Brazil; Goiás Mastology Research Network, Goiânia, Brazil; Teaching Hospital of the Federal University of Goiás, Goiânia, Brazil. Electronic address: ruffojr@terra.com.br.
2 Goiás Mastology Research Network, Goiânia, Brazil; Teaching Hospital of the Federal University of Goiás, Goiânia, Brazil.
3 Department of Medicine, PUCRS School of Medicine, Porto Alegre, Brazil.