1. Department of General and Digestive Surgery, Príncipe de Asturias Teaching Hospital, 28805 Alcalá de Henares, Spain
2. Department of Pathological Anatomy, Príncipe de Asturias Teaching Hospital, 28805 Alcalá de Henares, Spain
3. Department of Medicine and Medical Specialities, Faculty of Medicine and Health Sciences, University of Alcalá, 28801 Alcalá de Henares, Spain