1 Department of Neurosurgery, Albany Medical College, Albany, NY, USA.
2 Department of Neurosurgery, Baylor College of Medicine, Houston, TX, USA.
3 Department of Anesthesiology, Case Western Reserve University, Cleveland, OH, USA.
4 Hunter Pain Specialists, Newcastle, New South Wales, Australia.
5 Department of Neurosurgery, Albany Medical College, Albany, NY, USA; Department of Neuroscience & Experimental Therapeutics, Albany Medical College, Albany, NY, USA. Electronic address: jpilitsis@yahoo.com.