Comparative analysis between osteosarcoma and ewing's sarcoma: evaluation of the time from onset of signs and symptoms until diagnosis - Guerra, Raquel Bezerra; Tostes, Marcelo Duarte; Miranda, Leandro da Costa; Camargo, Olavo Pires de; Baptista, André Mathias; Caiero, Marcelo Tadeu; Machado, Telma Murias dos Santos; Abadi, Márcia Datz; Oliveira, Claudia Regina Gomes Cardim Mendes de; Filippi, Renée Zon (Clinics, 2006)