Marando, Marco, Adriana Tamburello, and Pietro Gianella. 2020. “False-Negative Nasopharyngeal Swab RT-PCR Assays in Typical COVID-19: Role of Ultra-Low-Dose Chest CT and Bronchoscopy in Diagnosis”. European Journal of Case Reports in Internal Medicine 7 (5). https://doi.org/10.12890/2020_001680.