Romano S, Salvaggio A, Lo Bue A, Marrone O, Insalaco G. A negative expiratory pressure test during wakefulness for evaluating the risk of obstructive sleep apnea in patients referred for sleep studies . Clinics [Internet]. 2011 Jan. 1 [cited 2024 Jul. 17];66(11):1887-94. Available from: https://revistas.usp.br/clinics/article/view/19387