Effectiveness and Physiological Safety of a Lung Vibration Device for Airway Clearance in Patients with Sputum Retention: A Randomized Crossover Study. - Padkao, Tadsawiya; Channak, Kamolthip; Kheunkhieo, Panupich; Taweekarn, Pimonpan; Vannajak, Kunavut; Boonla, Orachorn; Phoemsapthawee, Jatuporn; Prasertsri, Piyapong (Life (2075-1729), 2026)