الإتاحة: https://discovery.ucl.ac.uk/id/eprint/10183570/1/Vaccine%20effectiveness%20of%20BNT162b2%20and%20CoronaVac%20against%20SARS-CoV-2%20omicron%20infection%20and%20related%20hospital%20admission%20among%20pe.pdfTesthttps://discovery.ucl.ac.uk/id/eprint/10183570Test/
الإتاحة: https://doi.org/10.1177/0269881110376685Test