Evaluation of BBIBP-CorV Sinopharm COVID-19 vaccine effectiveness in Sri Lanka: a test-negative case control study by Dileepa Senajith Ediriweera, Shamila Thivanshi De Silva, Wathsala Wimalasena, Manjula Kariyawasam, Gihan Kosinna, Gayan Bogoda, Sumudu Senaratne, Kanchana Rathnayake, Inosha Weerarathna, Ranjan Premaratna, Prasanna Gunasena

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