Limsuwat, Chok, Nopakoon Nantsupawat, Elvira Umyarova, Kamonpun Ussavarungsi, and Kenneth Nugent. 2013. “Factors Affecting Mortality in Patients With COPD Exacerbations Requiring ICU Admission”. The Southwest Respiratory and Critical Care Chronicles 1 (2), 3-10. https://pulmonarychronicles.com/index.php/pulmonarychronicles/article/view/61.