1 Division of Acute and Perioperative Pain Medicine, Department of Anesthesiology, University of Florida College of Medicine, Gainesville, Florida, USA ABoezaart@anest.ufl.edu.
2 Department of Orthopaedic Surgery, University of Florida College of Medicine, Gainesville, Florida, USA.
3 Human Anatomy and Embryology Unit, Faculty of Medicine, Universitat de Barcelona, Barcelona, Spain.
4 Department of Anesthesiology, Madrid-Montepríncipe University Hospital, Madrid, Spain.
5 CEU San Pablo University School of Medicine, Madrid, Spain.