1. Department of Toxicology; Complutense University; Madrid Spain
2. Department of Anaesthesiology; Hospital General Universitario Gregorio Marañón; Madrid Spain
3. Department of Anaesthesiology; Guipúzcoa Polyclinic; Grupo Quirón Salud; San Sebastián Spain
4. Department of Anaesthesiology; Complexo Hospitalario Universitario de A Coruña; Spain
5. Department of Anaesthesiology; Complejo Asistencial Universitario de León; Spain
6. Department of Anaesthesiology; Hospital La Fe; Valencia Spain
7. Department of Anaesthesiology; Centro Hospitalar Universitario do Porto; Portugal
8. Anaesthesiology and Algology; KU Leuven; Leuven Belgium
9. Department of Anaesthesiology; Hospital Clinic de Barcelona; Spain