Kluayhomthong, Sujittra, Wilaiwan Khrisanapant, Seksan Chaisuksant, and Chulee U Jones. 2011. “Effectiveness of a New Breathing Device ‘BreatheMAX®’ to Increase Airway Secretion Clearance in Patients With Ventilatory Dependence”. Archives of Allied Health Sciences 23 (1). Khon Kaen, Thailand:95-108. https://he01.tci-thaijo.org/index.php/ams/article/view/66256.