Clarifying the Role of Hypoxia in Obstructive Sleep Apnea as a Potential Promulgator of Atrial Fibrillation in Ischemic Stroke Clarifying the Role of Hypoxia in Obstructive Sleep Apnea as a Potential Promulgator of Atrial Fibrillation in Ischemic Stroke Download Vitamin D Deficiency in Patients Referred for Evaluation of Obstructive Sleep Apnea Advancing Treatment of Comorbid PTSD and OSA