More information on sleep apnea can be found at: American Sleep Apnea Association http://sleepapnea.org/learn/sleep-apnea/central-sleep-apnea.html National Heart, Lung, and Blood Institute http://www.nhlbi.nih.gov/health/health-topics/topics/sleepapnea PubMed Health http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0002103/
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