1 Department of Clinical and Experimental Medicine University of Florence AOU Careggi, Italy.
2 Applied Anatomy Laboratory Department of Anatomy, Histology, and Neuroscience Autonomous University of Madrid Madrid , Spain.
3 Department of Anesthesia Hospital Infanta Leonor Madrid, Spain.
4 Outcomes Research Department Anesthesiology Institute, Cleveland Clinic Cleveland, OH, USA Department of Anesthesiology and Reanimation Istanbul University-Cerrahpa?a Cerrahpasa Medical Faculty Istanbul, Turkey.
5 Department of Anesthesiology and Reanimation Móstoles University Hospital Madrid, Spain.
6 Hospital Mexico San José, Costa Rica.
7 Hospital Interzonal General Dr. José Penna Bahia Blanca Buenos Aires, Argentina.