1. Health Planning Service, Regional Health Authority of Umbria; Perugia Italy
2. USLUmbria1; Epidemiological Planning; Perugia Italy 06100
3. Regional Health Authority of Umbria; Health Planning Service; Via Mario Angeloni 61 Perugia Umbria Italy 06124
4. University of Perugia; Department of General Surgery; Terni Italy 05100