1. Department of Anaesthesiology Hospital Universitario Infanta Leonor Madrid Spain
2. Department of Anaesthesiology Hospital Universitario Donostia San Sebastián Spain
3. Spanish Perioperative Audit and Research Network (RedGERM) Zaragoza Spain
4. Fluid Therapy and Hemodynamic Monitoring Group of the Spanish Society of Anesthesiology and Critical Care (SEDAR) Spanish Society of Anesthesiology and Critical Care (SEDAR) Madrid Spain
5. Department of Internal Medicine Complex Hospitalari Moisès Broggi Barcelona Spain
6. Department of Anaesthesiology Parc de Salut Mar Barcelona Spain
7. Department of Anaesthesiology Hospital Clínic Barcelona Barcelona Spain
8. Department of Anaesthesiology Hospital Universitario de Bellvitge Barcelona Spain
9. Universidad de Barcelona Barcelona Spain
10. Department of Anaesthesiology Hospital Universitario de Gran Canaria Doctor Negrín Las Palmas de Gran Canaria Spain
11. Department of Anaesthesiology Hospital Universitario Lucus Augusti Lugo Spain
12. Department of Anaesthesiology Hospital Central de la Cruz Roja, San José y Santa Adela Madrid Spain
13. Department of Anaesthesiology Hospital Universitario de Cabueñes Gijón Spain
14. Department of Anaesthesiology Hospital Universitario Marqués de Valdecilla Santander Spain
15. Department of Anaesthesiology Hospital Cantoblanco, Hospital Universitario La Paz Madrid Spain
16. Department of Anaesthesiology Hospital Universitario de Jerez de la Frontera Jerez de la Frontera Spain
17. Department of Anaesthesiology Hospital Universitario de Burgos Burgos Spain
18. Department of Anaesthesiology Hospital Universitario Son Espases Palma de Mallorca Spain
19. Department of Anaesthesiology Hospital Universitario Dr Peset Valencia Spain
20. Department of Anaesthesiology Hospital Universitario de Cáceres Cáceres Spain
21. Servicio de Anestesiología Hospital Universitario de Vic Vic Spain
22. Department of Anaesthesiology Brigham and Women's Hospital Boston USA
23. Department of Anaesthesiology Hospital Universitario Rio Hortega Valladolid Spain
24. Servicio Navarro de Salud—Osasunbidea Banco de Sangre y Tejidos Pamplona Spain