1. Institut Jules Bordet, Université Libre de Bruxelles (U.L.B.), Brussels, Belgium
2. Unit of Medical Oncology 2, Azienda Ospedaliera-Universitaria Pisana, Pisa, Italy
3. Medical Oncology department, AC Camargo Cancer Center, Sao Paulo, Brazil
4. Latin American Cooperative Oncology Group (LACOG), Porto Alegre, Brazil