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https://www.mayoclinic.org/diseases-conditions/heart-failure/symptoms-causes/syc-20373142
https://www.heart.org/en/health-topics/heart-failure/what-is-heart-failure
https://www.nhlbi.nih.gov/health-topics/heart-failure
https://www.everydayhealth.com/congestive-heart-failure/guide/
https://medlineplus.gov/heartfailure.html
https://my.clevelandclinic.org/health/diseases/17069-heart-failure-understanding-heart-failure
https://www.cdc.gov/dhdsp/data_statistics/fact_sheets/fs_heart_failure.htm
https://www.cardiosmart.org/Heart-Conditions/Heart-Failure
https://www.hrsonline.org/Patient-Resources/Heart-Diseases-Disorders/Heart-Failure
https://www.dicardiology.com/channel/heart-failure​
