Albert Leung M.D. 1,2,* , Youichi Saitoh M.D., Ph.D. 3, Jean-Pascal LefaucheurM.D. 4, Eman Khedr M.D. 5, Daniel Ciampi de Andrade M.D. 6. 1 Departmentof Anesthesiology, Center for Pain Medicine, UCSD School of Medicine, CA,USA; 2 Center for Pain and Heada