1. Takeda F (1991) WHO cancer relief programme. In: Bond MR, Charlton JE, Woolf CJ (eds) Proceedings of the VIth World Congress on Pain. Pain Research and Clinical Management, vol 4. Elsevier, Amsterdam, pp 467?474
2. Cancer Pain Relief (1986) World Health Organization, Geneva, 1986
3. Corli O, Roma G, Battaiotto L, Bernoni M (1988) Buprenorphine and diclofenac in cancer pain relief. Schmerz Pain Douleur 9: 114?115
4. Ventafridda V, Fochi C, DeConno F, Sganzeria E (1980) Use of nonsteroidal anti-inflammatory drugs in the treatment of pain in cancer. Br J Clin Pharmacol 10: 343?346
5. Foley KM (1985) The treatment of cancer pain. N Engl J Med 313: 84?95