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View a comprehensive set of ATS patient and public health education materials on pulmonary, critical care, sleep disorders and other related topics which are open access and free to use for informational purposes. These materials are reviewed for accuracy and currency and updated every few years. Please take note of the date published/updated when using. If you see content that requires updating, please send an email to jcorn@thoracic.org with the title, specific text that requires editing, and any other feedback. Thank you for your interest in ATS Patient Education.