Next Slideshow Title
IMAGES PROVIDED BY:
(1) Scott Camazine / Photo Researchers, Inc. and Purestock
(2) John M. Daugherty and BSIP / Photo Researchers, Inc., Purestock
(3) White Packert / Photonica
(4) Gary S. Settles / Photo Researchers, Inc.
(5) Jamie Grill and Amy Strycula / Flickr
(6) Olivier Voisin / Photo Researchers, Inc.
(7) Peter Dazeley / Photographer's Choice
(8) Karsten Schneider / Photo Researchers, Inc.
(9) David De Lossy / Photodisc
(10) Dr. David Phillips / Visuals Unlimited
(12) BSIP / Photo Researchers, Inc.
(13) Robert Golden / Fresh Food Images
(14) IAN HOOTON / SPL
American Cancer Society.
American Lung Association.
Brunton, S. American Journal of Managed Care, October 2004.
Centers for Disease Control and Prevention.
ERS Task Force. European Respiratory Journal, September 2004.
Martinez, F. Comprehensive Therapy, Spring 2004.
National Institutes of Health.
Smucny, J. Cochrane Database System Reviews, October 2004.
Steinman, M. American Journal of Geriatric Society, June 2004.
University of California San Francisco Medical Center.
Reviewed by Jennifer Robinson, MD on January 11, 2018
This tool does not provide medical advice. See additional information.
THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.
View our slideshows to learn more about your health.