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American Heart Association: “Treatment Options for Heart Failure,” “Causes and Risks for Heart Failure,” “Warning Signs of Heart Failure,” “Is Broken Heart Syndrome Real?”
American Lung Association: “Pneumonia,” “Carbon Monoxide.”
American Psychological Association: “Stress effects on the body.”
CDC: “Smoking and COPD,” "How Coronirus Spreads," "Symptoms of Coronirus," "What to Do if You Are Sick."
Cleveland Clinic: “Pulmonary Embolism.”
Mayo Clinic: “Common cold,” “Pneumothorax,” “Anemia,” “Carbon monoxide poisoning,” “Allergies and asthma: They often occur together,” “Asthma.”
NIH National Heart, Lung, and Blood Institute: “What is COPD?” “Venous Thromboembolism.”
NIH National Institute of Neurological Disorders and Stroke: “Myasthenia Gris Fact Sheet.”
NIH National Institute of Diabetes and Digestive and Kidney Disorders: “Health Risks of Being Overweight.”
Nemours Foundation: “About Breath-Holding Spells.”
National Health Service: “Breath-holding spells in children.”
PubMed Health: “Pulmonary Embolism.”