1. Clinical practice guideline acute pain management: operative or medical procedures and trauma;Agency for Health Care Policy and Research (AHCPR),1992
2. Assessment of patients experience of discomforts during respirator therapy;Bergbom-Engberg;Crit Care Med,1989
3. Postoperative pain: patients’ expectations and experiences;Carr;J Adv Nur,1990
4. Anticipating and experiencing post-operative pain: the patients perspective;Carr;J Clin Nur,1997
5. The problem of pain in the critically ill patient;Christoph;Crit Care Nurs Clin North Am,1991