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  1. Sleep apnea - Symptoms and causes - Mayo Clinic

  2. Sleep Apnea: Types, Causes, Risk Factors, Effects on Health

  3. Sleep Apnea: Symptoms and Causes | Sleep Foundation

  4. Sleep apnea - Diagnosis and treatment - Mayo Clinic

  5. Obstructive sleep apnea - Symptoms and causes - Mayo Clinic

  6. Sleep apnea - Wikipedia

  7. Sleep Apnea - What Is Sleep Apnea? | NHLBI, NIH

  8. Sleep Apnea | Johns Hopkins Medicine

  9. Sleep Apnea: What It Is, Causes, Symptoms & Treatment

  10. Sleep Apnea Symptoms | Sleep Foundation