TY - STAND AU - C. Chapman AU - D. Bradshaw BT - J Pain Palliat Care Pharmacother DO - 10.3109/15360288.2013.846957 M1 - 4 PY - 2013 SP - 370 EP - 7 T2 - J Pain Palliat Care Pharmacother TI - Only modest long-term opioid dose escalation occurs over time in chronic nonmalignant pain management VL - 27 SN - 1536-0288 ER -