1. 2) Pasero C, Puntillo K, Li D, et al. Structured approaches to pain management in the ICU. Chest 2009;135:1665-72.
2. 3) Barr J, Fraser GL, Puntillo K, et al. Clinical practice guideline for the management of pain, agitation, and delirium in adult patients in the intensive care unit. Crit Care Med 2013;41:263-306.
3. 4) American Association of Critical-Care Nurses (AACN). Assessing pain in the critically ill adult (with AACN Levels of Evidence and complete reference list). Available from: http://www.aacn.org/wd/practice/content/practicealerts/assessing-pain-critically-ill-adult.pcms?menu=practice
4. 5) Puntillo KA. Pain experience of intensive care unit patients. Heart Lung 1990;19:526-33.
5. 7) Puntillo KA. Pain management. In: Schell HM, Puntillo KA, editors. Critical care nursing secrets 2nd ed. Philadelphia: Mosby; 2006. p. 673-82.