1. General Surgery Unit, University Hospital of Parma Parma University Parma Italy
2. Department of Public Health, Service for Health and Safety in the Workplace Local Health Unit of Reggio Emilia ‐ Regional Health Service of Emilia Romagna Reggio Emilia Italy
3. Pathological Anatomy and Histology Unit, University Hospital of Parma Parma University Parma Italy
4. General Surgery Unit, Hospital of Vaio, Fidenza (Parma) Local Health Unit of Parma ‐ Regional Health Service of Emilia Romagna Parma Italy
5. General Surgery Unit University Hospital of Parma Parma Italy