1. Standards for the diagnosis and care of patients with chronic obstructive pulmonary disease;American Thoracic Society;Am J Respir Crit Care Med,1995
2. Deaths: final data for 1997;Hoyert;Natl Vital Stat Rep,1999
3. Current estimates from the National Health Interview Survey, 1995;Benson;Vital Health Stat,1998
4. The impact of COPD on lung health worldwide: epidemiology and incidence;Hurd;Chest,2000
5. Global strategy for the diagnosis, management, and prevention of chronic obstructive pulmonary disease;Pauwels;Am J Respir Crit Care Med,2001