@misc{9287,
  author = {W. Gao and M. Gulliford and M. Bennett and F. Murtagh and I. Higginson},
  title = {Managing cancer pain at the end of life with multiple strong opioids: a population-based retrospective cohort study in primary care},
  year = {2014},
  journal = {PLoS One},
  volume = {9},
  number = {1},
  pages = {e79266},
  issn = {1932-6203},
  doi = {10.1371/journal.pone.0079266},
}