1. Division of Oncology, “Mons. R Dimiccoli” Hospital, Viale Ippocrate, 15, 76121 Barletta (BT), Asl BAT, Italy
2. Clinical Pathology Laboratory, National Cancer Research Centre, Istituto Tumori “Giovanni Paolo II”, Viale Orazio Flacco, 65, 70100 Bari, Italy
3. Interdisciplinary Department of Medicine, University of Bari School of Medicine, Piazza G. Cesare, 11, 70124 Bari, Italy
4. National Institute for Digestive Diseases, IRCCS “Saverio De Bellis”, Via Turi 27, 70013, Castellana Grotte, Bari, Italy
5. Division of Oncology, “S Francesco di Paola” Hospital, Via Promintesta, 1, 87027 Paola (CS), ASP, Italy
6. Department of Internal Medicine & Clinical Specialties, University of Rome “La Sapienza”, Policlinico Umberto I, Viale del Policlinico, 155, 00161 Roma, Italy