Adherence to Continuous Positive Airway Pressure in Existing Users: Self-Efficacy Enhances the Association between Continuous Positive Airway Pressure and Adherence Adherence to Continuous Positive Airway Pressure in Existing Users: Self-Efficacy Enhances the Association between Continuous Positive Airway Pressure and Adherence Download Upper Airway Stimulation for Obstructive Sleep Apnea: Self-Reported Outcomes at 24 Months Body Position May Influence Oronasal CPAP Effectiveness to Treat OSA