Acknowledgements
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We would like to thank all sputum donors for their participation in this study and David Rodriguez for his assistance with figure preparations. Flow cytometric data acquisition was performed at the University of Texas Health San Antonio flow cytometry core facility (LSRII), which is supported by NIH-NCI P30 CA054174-20 and UL1 TR001120 grants, and at Precision Pathology Services (Navios EX).