1. Department of Anatomy, Histology and Neuroscience, School of MedicineUniversidad Autónoma de Madrid Madrid Spain
2. Department of Anesthesiology and ReanimationMóstoles University Hospital Madrid Spain
3. Department of Anesthesiology and ReanimationPuerta del Sol Hospital Málaga Spain
4. Department of Anesthesiology and ReanimationFigueres Hospital Girona Spain
5. Department of Anesthesiology and ReanimationJoan XXXIII University Hospital Tarragona Spain
6. Department of Anesthesia, Intensive Care and Pain TherapyBalgrist University Hospital Zürich Switzerland