6Gupta D, Lis C G, Grutsch J F. The relationship be- tween cancer related fatigue and patient satisfaction with quality of life in cancer[J]. J Pain Symptom Manage, 2007,34 (1) : 40-47.
7Krames E. Implantable devices for pain control: spinal cord stimulation and intrathecal therapies[J]. Best Pract Res Clin Anaesthesiol, 2002,16 (4) :619-649.
8Wang J K, Nauss L A, Thomas J E. Pain relief by in- trathecal applied morphine in man[J]. Anesthesiology, 1979,50(2) : 149-152.
9Cramond T. Invasive techniques for neuropathic pain[M]// Bruera E,Portenoy R K. Topics in palliative care(vol 2). London: Oxford University Press, 1998 : 63-86.
10Davis MP, Walsh D. Epidemiology of cancer pain and factors influencing poor pain control[ J]. Am J Hosp Palliat Care, 2004, 21 (2) :137-142.
