Detection of SARS-CoV-2 by bronchoscopy after negative nasopharyngeal testing: Stay vigilant for COVID-19 oleh Kathleen J. Ramos, Siddhartha G. Kapnadak, Bridget F. Collins, Paul S. Pottinger, Richard Wall, James A. Mays, Garrett A. Perchetti, Keith R. Jerome, Sandeep Khot, Ajit P. Limaye, Patrick C. Mathias, Alexander Greninger