1 Anesthesiology and Perioperative Medicine, University of Louisville, Louisville, KY, USA Pain Management Center of Paducah, 2831 Lone Oak Road, Paducah, KY 42003, USA Mid Atlantic Spine & Pain Physicians, Newark, DE, USA Pain Medicine Fellowship Program, Temple University Hospital, Philadelphia, PA, USA Minimally Invasive Spine Surgery, Interventional Radiology, Endovascular Neurosurgery and Neuroendovascular Program, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.