1. Department of Anaesthesia and Critical Care, Infanta Leonor University Hospital, Madrid, Spain
2. Universidad Complutense de Madrid, Madrid, Spain
3. Spanish Perioperative Audit and Research Network, Zaragoza, Spain
4. Grupo Español de Rehabilitación Multimodal, Enhanced Recovery After Surgery Spain Chapter, Zaragoza, Spain
5. Department of General Surgery, Lozano Blesa University Hospital, Zaragoza, Spain
6. Department of Anaesthesia and Perioperative Medicine, Río Hortega University Hospital, Valladolid, Spain