1 Hospital Regina, Novo Hamburgo, Brazil. Electronic address: [email protected].
2 Latin American Cooperative Oncology Group, Porto Alegre, RS, Brazil.
3 Hospital Regina, Novo Hamburgo, Brazil.
4 Medical School, Unisinos, São Leopoldo, RS, Brazil; Thyroid Unit, Division of Endocrinology, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil.