1. Department of General Surgery, Abdominal Wall Surgery Unit and General and Digestive Surgery Research Group, Institut de Recerca Vall d'Hebron (VHIR), Hospital Universitari Vall d'Hebron, Barcelona, Spain.
2. Department of Infectious Diseases, Hospital Universitari Vall d'Hebron, Barcelona, Spain.
3. DPhil Programme in Evidence-Based Healthcare, University of Oxford, Oxford, United Kingdom.