Chras, George I., Manos Alchanatis, Charis Roussos, Alexandra Manolessou, and Nikolaos G. Koulouris. “Negative Expiratory Pressure (NEP) Technique and Anthropometric Derived Indices As Surrogate Markers for Predicting Obstructive Sleep Apnea Syndrome (OSAS)”. Global Journal of Respiratory Care 4 (February 27, 2017): 1–15. Accessed March 15, 2025. https://savvysciencepublishers.com/index.php/gjrc/article/view/119.