American Association for Home Care
American Association for Retired Persons
American Association for Respiratory Care
American Cancer Society
American Heart Association
American Lung Association
Bon Secours of Hampton Roads
Cancer Symptoms
CHEST Journal
Heart Information
Medical Dictionary
National Heart, Lung and Blood Institute
PERF (Pulmonary Education and Research Foundation)
Portable Oxygen (A users perspective)
PulmonologyLinx
Quit Smoking Support (CDC)
The Respiratory System
Riverside On-line
Sentara Hospital
Virginia Oncology Associates