Patients' perceptions of nasopharyngeal aspiration in the emergency department of a teaching hospital in Hong Kong | Emergency Medicine Journal
COVID-19 and Respiratory Viruses PCR Nasopharyngeal Collection Instructions | Public Health Ontario
Nasopharyngeal Swab vs Nasal Swab: Comparing Methods
Variability in instructions for performance of nasopharyngeal swabs across Canada in the era of COVID-19 – what type of swab is actually being performed? | Journal of Otolaryngology - Head & Neck