Comparison of clinical outcomes in critically ill COVID-19 patients on mechanical ventilation with nosocomial pneumonia between Alpha and Omicron variants.

"The authors declare that there is no conflict of interest."

"Funding: The authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This research was funded by grants from Taipei Veterans General Hospital (V111B-024, V112B-031, V112A-010, V112C-068, and V112D65-003-MY2-1), Yin Shu-Tien Foundation Taipei Veterans General Hospital-National Yang-Ming University Excellent Physician Scientists Cultivation Program (108-V-A-005), and National Science and Technology Council (Taiwan) (MOST 109-2314-B-010-051-MY3, NSTC 112-2314-B-075-050). This work was supported by grants from the Ministry of Education, Higher Education SPROUT Project for Cancer Progression Research Center (111W31101), and Cancer and Immunology Research Center (112W31101)."