1. Unit of Endocrine, Digestive and Emergency Surgery, Department of Biomedical Sciences and Human Oncology, University Medical School of Bari, Bari, Italy.
2. Unit of General Surgery, Department of General Surgery, University Medical School of Catania, Catania, Italy.
3. Unit of Anatomic Pathology, Department of Emergency and Organ Transplantation, University Medical School of Bari, Bari, Italy.