1 Department of Anatomy and Embryology, Faculty of Medicine, Universidad Complutense de Madrid, Madrid, Spain.
2 Department of Anatomy, Histology and Embryology, Institute of Clinical and Functional Anatomy, Medical University of Innsbruck (MUI), Müllerstr. 59, 6020, Innsbruck, Austria. marko.konschake@i-med.ac.at.
3 Unidad de Columna. Servicio de COT., Hospital Plató., Barcelona, Spain.
4 Computer Science and Statistics, URJC., Madrid, Spain.
5 Instituto Universitario de Evaluación Sanitaria, UCM, Madrid, Spain.
6 Department of Orthopedics. Hospital, Universitario Santa Cristina, Madrid, Spain.
7 Human Anatomy and Embryology Unit, Department of Surgery, Medical and Social Sciences, Scholl of Medicine and Health Sciences, University of Alcalá, UAH, Alcalá de Henares, Madrid, Spain.
8 Department of Anatomy, Histology and Embryology, Institute of Clinical and Functional Anatomy, Medical University of Innsbruck (MUI), Müllerstr. 59, 6020, Innsbruck, Austria.
9 Department of Neurosurgery, Medical University of Innsbruck (MUI), Innsbruck, Austria.
10 Department of Neurosurgery, Tulane University School of Medicine, New Orleans, LA, USA.
11 Department of Neurology, Tulane University School of Medicine, New Orleans, LA, USA.
12 Department of Surgery, Tulane University School of Medicine, New Orleans, LA, USA.
13 Department of Structural and Cellular Biology, Tulane University School of Medicine, New Orleans, LA, USA.
14 Department of Neurosurgery and Ochsner Neuroscience Institute, Ochsner Health System, New Orleans, LA, USA.
15 Department of Anatomical Sciences, School of Medicine, St. George's University, West Indies, Grenada.