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Sleep apnea - Symptoms and causes - Mayo Clinic
Sleep Apnea: What It Is, Causes, Symptoms & Treatment - Cleveland Clinic
Sleep apnea - Wikipedia
Sleep Apnea: Types, Causes, Risk Factors, Effects on Health - WebMD
Sleep Apnea - National Institute of Neurological Disorders and Stroke
Sleep Apnea: Symptoms and Causes - Sleep Foundation
Obstructive sleep apnea - Symptoms and causes - Mayo Clinic
Sleep Apnea - Johns Hopkins Medicine
Sleep Apnea - What Is Sleep Apnea? - NHLBI, NIH
Sleep Apnea - Lung and Airway Disorders - Merck Manual Consumer Version