1. Agency for Health Care Policy and Research: Agency for Health Care Policy and Research: Acute pain management—Guideline technical report, number 1. Rockville, MD, US Department of Health and Human Services, 1995
2. Cancer-related pain—II. Assessment with visual analogue scales;Ahles;J Psychosom Res,1984
3. The effect of transcutaneous electric nerve stimulation on postoperative pain and pulmonary function;Ali;Surgery,1981
4. Standardization of spirometry, 1994 update: American Thoracic Society;Am J Respir Crit Care Med,1995
5. Severity and impact of pain after day-surgery;Beauregard;Can J Anaesth,1998