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References for Survey Summary
- Petty TL. A new national strategy for COPD. J Resp Dis. 1997; 18(4):365-369.
- National Center for Health Statistics. Raw data from the National Health Interview Survey; 1998.
- National Center for Health Statistics. Report of Final Mortality Statistics; 1998.
- Bestall JC et al. Usefulness of the Medical Research Council Dyspnea Scale as a measure of disability in patients with chronic obstructive pulmonary disease. Thorax. 1999; 54:581-586.
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