1. Department of Gastroenterology, Centro Hospitalar Universitário de São João
2. WGO Gastroenterology and Hepatology Training Center
3. Faculty of Medicine of the University of Porto
4. Department of Facilities Operations, Centro Hospitalar Universitário de São João, Porto, Portugal
5. Gastroenterology and Endoscopy Unit, Edouard Herriot Hospital, Lyon, France
6. Department of Gastroenterology and Hepatology, Hospital Universitario Ramón y Cajal, Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), CIBEREHD, Universidad de Alcalá, Madrid, Spain