00391nas a2200133   4500000000100000000000100001008004100002100001700043700001100060245015400071300001100225490000700236022001400243       2012                            d1 aI. Higginson1 aW. Gao00aOpioid prescribing for cancer pain during the last 3 months of life: associated factors and 9-year trends in a nationwide United Kingdom cohort study  a4373-90 v30  a0732-183x