1. National Health Interview Survey, 2002;National Center for Health Statistics,2002
2. Chronic obstructive pulmonary disease surveillance—United States, 1971-2000;Mannino;MMWR Surveill Summ,2002
3. 2004 NHLBI Morbidity and Mortality Chartbook;National Heart Lung and Blood Institute,2004
4. The EuroQoL instrument: an index of health-related quality of life;Kind,1996