1. Deaths: final data for 1996;Peters;Natl Vital Stat Rep,1998
2. Incidence, prevalence and mortality: intra-and inter-country difference;Higgins,1990
3. Chronic obstructive pulmonary disease surveillance, United States 1971–2000;Mannino;MMWR Surveill Summ,2002
4. Outcomes following acute exacerbation of severe chronic obstructive lung disease;Connors;The SUPPORT investigators (Study to Understand Prognoses and Preferences for Outcomes and Risks of Treatment). Am J Respir Crit Care Med,1996
5. Hospital and 1-year survival of patients admitted to intensive care units with acute exacerbation of chronic obstructive pulmonary disease;Seneff;JAMA,1995