1. Department of Gastroenterology University Hospital Saint PierreUniversité Libre de Bruxelles Brussels Belgium
2. Department of Hospital Hygiene University Hospital Saint PierreUniversité Libre de Bruxelles Brussels Belgium
3. Department of Infectious Diseases University Hospital Saint PierreUniversité Libre de Bruxelles Brussels Belgium
4. Department of Digestive Surgery University Hospital Saint PierreUniversité Libre de Bruxelles Brussels Belgium