1. Pathology Service, Addarii Institute of Oncology, S. Orsola-Malpighi Hospital, Bologna, Italy
2. Section of Pathological Anatomy, Marche Polytechnic University, School of Medicine, United Hospitals, Ancona, Italy
3. Department of Surgery, Cordoba University Medical School, Cordoba, Spain
4. Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, Indianapolis, IN, USA