TY - STAND AU - W. Gao AU - M. Gulliford AU - M. Bennett AU - F. Murtagh AU - I. Higginson BT - PLoS One DO - 10.1371/journal.pone.0079266 M1 - 1 PY - 2014 EP - e79266 T2 - PLoS One TI - Managing cancer pain at the end of life with multiple strong opioids: a population-based retrospective cohort study in primary care VL - 9 SN - 1932-6203 ER -