Effectiveness of CoronaVac and BNT162b2 covid-19 mass vaccination in Colombia: a population-based cohort study by Paternina-Caicedo, A, Jit, M, Alvis-Guzmán, N, Fernández, JC, Hernández, J, Paz-Wilches, JJ, Rojas-Suarez, J, Dueñas-Castell, C, Alvis-Zakzuk, NJ, Smith, A, De La Hoz-Restrepo, F