 - Participants diagnosed by: i computerized tomography CT or magnetic resonance imaging MRI when necessary; ii neurological sensorimotor functional examination; iii standard motor power scale; iv pain sensation scales including the multidimensional tools: the Visual Analogue Scale of Pain Intensity for back and leg pain, the McGill Pain Questionnaire, and the Oswestry Disability Index; and v Quality of life assessment based on the SF-36 questionnaire. 