Maintenance Negative Pressure Ventilation Improves Survival in COPD Patients with Exercise Desaturation. - Huang, Hung-Yu; Lo, Chun-Yu; Yang, Lan-Yan; Chung, Fu-Tsai; Sheng, Te-Fang; Lin, Horng-Chyuan; Lin, Chang-Wei; Huang, Yu-Chen; Chang, Chee-Jen; Chung, Kian Fan; Wang, Chun-Hua (Journal of Clinical Medicine, 2019)