“Variety of Antibody Responses to BNT162b2 and BBIBP-CorV Vaccinations Against COVID-19 Infections in Baghdad and Fallujah, Iraq”. UKH Journal of Science and Engineering, vol. 7, no. 1, Aug. 2023, pp. 17-25, https://doi.org/10.25079/ukhjse.v7n1y2023.pp17-25.