1. The Spine & Pain Institute of New York New York New York USA
2. Department of Anesthesiology NYU Langone Medical Center New York New York USA
3. Department of Anesthesiology Zucker School of Medicine at Hofstra Northwell Manhasset New York USA
4. Department of Neurosurgery NYU Langone Medical Center New York New York USA
5. Department of Anesthesiology and Perioperative Medicine Brown University Providence Rhode Island USA
6. Department of Anesthesiology Rush University Medical Center Chicago Illinois USA
7. Department of Anesthesiology Cooper Medical School of Rowan University, Cooper University Hospital Camden New Jersey USA
8. The Spine and Nerve Center of the Virginias Charleston West Virginia USA
9. Rijnstate Ziekenhuis Velp The Netherlands