3Zech DL, Grond S, Lynch J,et al. Validation of World Health Organization guidelines for cancer pain relief: a 10 year prospective study [ J ]. Pain, 1995,63:65-67.
4Cherny NL,Portenoy RK. Cancer pain: principles of assessment and syndromes[ M]// Wall PD, Melzach R. Textbook of pain. 3th ed. Edinburgh: Churchill Livingstone, 1994:787.
10van den Beuken-van Everdingen MH,de Rijke JM,Kessels AG,et al,Prevalence of pain in patientswith cancer:a systematic review of the past 40 yea-rs.Ann Oncol,2007,18:1437~1449.