@misc{9439,
  author = {C. Chapman and D. Bradshaw},
  title = {Only modest long-term opioid dose escalation occurs over time in chronic nonmalignant pain management},
  year = {2013},
  journal = {J Pain Palliat Care Pharmacother},
  volume = {27},
  number = {4},
  pages = {370-7},
  issn = {1536-0288},
  doi = {10.3109/15360288.2013.846957},
}