1. Department of Radiation Oncology, University of Florence, Florence
2. Molecular and Nutritional Epidemiology Unit, Istituto per lo Studio e la Prevenzione Oncologica (ISPO), Florence
3. II Pneumology Unit, Azienda Ospedaliero-Universitaria Careggi, Florence
4. Department of Radiation Oncology, University of Modena, Modena
5. Department of RadiationOncology, Santa Maria Annunziata Hospital, Florence
6. Radiotherapy Unit Santa Chiara, Univeristy of Florence, Florence, Italy