1. Department of Anaesthesia and Critical Care, Infanta Leonor University Hospital, Madrid, Spain
2. School of Medicine, Universidad Complutense de Madrid, Madrid, Spain
3. Spanish Perioperative Audit and Research Network (REDGERM)
4. Grupo Español de Rehabilitación Multimodal, Enhanced Recovery After Surgery Spain Chapter, Madrid
5. Department of Anaesthesia and Critical Care, Ramón y Cajal University Hospital, Madrid, Spain
6. Department of Anaesthesia, Donostia University Hospital/Donostia Unibertsitate Ospitalea, San Sebastián, Spain
7. Department of Anaesthesia, Complejo Hospitalario Universitario De Vigo–Eoxi Vigo, Vigo, Spain
8. Department of Anaesthesia, Hospital Universitario Clínico San Carlos, Madrid, Spain
9. Department of Anaesthesia, Hospital Universitario de Álava, Vitoria-Gasteiz, Spain
10. Department of Anaesthesia, Consorcio Hospital General Universitario de Valencia, Valencia, Spain
11. Department of Anaesthesia, Hospital Universitario Sierrallana, Torrelavega, Spain
12. Department of Anaesthesia, Hospitales del Parc de Salut Mar, Barcelona, Spain
13. Department of Anaesthesia, Hospital Clínic de Barcelona, Barcelona, Spain
14. Department of Anaesthesia and Critical Care, La Paz University Hospital, Madrid, Spain
15. Department of Anaesthesia and Critical Care, Hospital Universitario Central de Asturias, Oviedo, Spain
16. Department of Anaesthesia, Hospital General Universitario de Ciudad Real, Ciudad Real, Spain
17. Department of Anaesthesia, Hospital Universitario Rey Juan Carlos, Móstoles, Spain
18. Department of Anaesthesia, Hospital de Mataró, Mataró, Spain
19. Department of Anaesthesia, Hospital Universitario de Fuenlabrada, Fuenlabrada, Spain
20. Department of Anaesthesia, Hospital de Galdakao-Usansolo, Bizkaia, Spain
21. Department of Anaesthesia, Hospital de La Cruz Roja, Gijón, Spain
22. Department of Anaesthesia, Hospital Universitario 12 de Octubre, Madrid, Spain
23. Department of Anaesthesia, Althaia Xarxa Assistencial Universitària de Manresa, Barcelona, Spain
24. Department of Anaesthesia, Hospital Universitario de Jaén, Jaén, Spain
25. Department of Anaesthesia, Hospital Quirón, Zaragoza, Spain
26. Department of Anaesthesia, Hospital Universitario de Léon, Léon, Spain
27. Department of Anaesthesia, Hospital Clínico Universitario de Valladolid, Valladolid, Spain
28. Department of Anaesthesia, Hospital Universitario de Cruces, Bilbao, Spain
29. Department of Anaesthesia, Hospital Universitario Virgen del Rocío, Sevilla, Spain
30. Department of Anaesthesia, Complejo Hospitalario de Mérida, Mérida, Spain
31. Department of Orthopedia, Infanta Leonor University Hospital, Madrid, Spain
32. Department of Anaesthesia, Hospital Universitario Fundación Alcorcón, Alcorcón, Spain
33. Department of Anaesthesia, Clínica Santa Cristina, Albacete, Spain
34. Department of Anaesthesia, Hospital Universitario Miguel Servet, Zaragoza, Spain
35. Department of Anaesthesia, Hospital Universitario Virgen Macarena, Sevilla, Spain
36. Department of Anaesthesia, Hospital Sant Joan Despí Moisès Broggi, Sant Joan Despí, Spain
37. Department of Anaesthesia, Complejo Hospitalario Universitario de A Coruña, Coruña, Spain
38. Instituto Aragonés de Ciencias de la Salud, Zaragoza, Spain
39. Department of Surgery, Lozano Blesa University Hospital, Zaragoza, Spain
40. Blood and Tissue Bank of Navarra, Servicio Navarro de Salud-Osasunbidea, Pamplona, Navarra, Spain
41. Department of Anaesthesia and Perioperative Medicine, Río Hortega University Hospital, Valladolid, Spain