1. Gastrointestinal Bleeding Unit; Department of Gastroenterology; Hospital de la Santa Creu i Sant Pau; Autonomous University; Barcelona Spain
2. Department of Epidemiology and Iberioamerican Cochrane Center; Hospital de la Santa Creu i Sant Pau; Autonomous University; Barcelona Spain
3. Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd); Barcelona Spain
4. Department of Gastroenterology; Hospital Arnau de Vilanova; Lleida Spain