- American Association of Retired Persons www.aarp.org
- American Heart Association www.americanheart.org
- American Public Health Association www.apha.org
- Home Care Association of America www.hcaoa.org
- MedicineNet www.medicinenet.com
- National Heart, Lung, and Blood Institute www.nhlbi.nih.gov
- World Health Organization www.who.int
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