Up to Date.... www.patients.uptodate.com/

Medline Plus.... www.nlm.nih.gov/medlineplus/

National Heart, Lung, and Blood Institute.... www.nhlbi.nih.gov/

American College of Chest Physicians.... www.chestnet.org/education/patient/

American Lung Association.... www.lungusa.org

Nature's Beauty Bar.... www.naturesbeautybar.com