1. Department of Neurosurgery, The University of Texas Southwestern, Dallas, TX
2. Department of Neurosurgery, Loma Linda University, Anderson St., Loma Linda, CA
3. Department of Neurosurgery, University of Cincinnati, Cincinnati, OH
4. The LAU Gilbert and Rose-Marie Chagoury School of Medicine; Beirut, Lebanon
5. Saguaro Pain Clinic, Mesa, AZ