1. Surgical Unit ‘M. Rubino’, Department of Emergency and Organ Transplantation, University Aldo Moro of Bari, Bari, Italy
2. Apulian Breath Analysis Centre (CeRBA), Istituto Di Ricovero e Cura a Carattere Scientifico (IRCCS) Istituto Tumori Giovanni Paolo II, Bari, Italy
3. Department of Chemistry, University Aldo Moro of Bari, Bari, Italy
4. Surgical Unit, Azienda Ospedaliero-Universitaria Policlinico Bari, Bari, Italy
5. Statistical Unit, Department of Biomedical Sciences and Human Oncology, University Aldo Moro of Bari, Bari, Italy