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About Chronic Diseases | CDC - Centers for Disease Control and …
Chronic Disease Center (NCCDPHP) | CDC
Chronic condition - Wikipedia
Noncommunicable diseases - World Health Organization (WHO)
What Is a Chronic Illness? - Healthline
Chronic Disease Fact Sheets | CDC
Chronic Diseases | American Medical Association
Chronic kidney disease - Symptoms and causes - Mayo Clinic
The Top 10 Most Common Chronic Diseases for Older Adults
COPD - Symptoms and causes - Mayo Clinic