Romano, Salvatore, Adriana Salvaggio, Raquel Pastrello Hirata, Anna Lo Bue, Stefano Picciolo, Luis Vicente Franco de Oliveira, and Giuseppe Insalaco. “ Upper Airway Collapsibility Evaluated by a Negative Expiratory Pressure Test in Severe Obstructive Sleep Apnea ”. Clinics 66, no. 4 (January 1, 2011): 567–572. Accessed June 29, 2024. https://revistas.usp.br/clinics/article/view/19586.