Ardiansyah, M. Y.; Zarfiardy Aksa Fauzi; Rohani Lasmaria S. The Relationship Between COVID-19 Vaccination and the Severity of COVID-19 in Patients Treated for the Period August 2021 – August 2022 at Arifin Achmad General Hospital, Riau Province, Indonesia. Bioscmed 2023, 8, 4111-4116.