Conditions:   Neuropathic Pain;   Spinal Stenosis
Intervention:   Drug: transdermal fentanyl matrix, gabapentin
Sponsors :   Seoul National University Hospital;   Seoul National University Bundang Hospital;   Masan Samsung Hospital, South Korea;   Asan Medical Center;   Inje University;   Chonnam National University Hospital;   Chung-Ang University
Enrolling by invitation - verified July 2011