Safety and immunogenicity of heterologous COVID-19 vaccine regimens to deal with product shortage: A randomised clinical trial in an elderly population by M.A. Kundro, M.H. Losso, A. Macchia, I. Pastor, M. Alonso Serena, C. Gestoso, L. Moreno Macías, F. Crupi, M.C. Acosta, S. Ivalo, M. Ghioldi, M.B. Bouzas, L. Mammana, I. Zapiola, I. Mazzitelli, A. Varese, J. Geffner, C. Biscayart, P. Angeleri, E. Lopez, A. Gentile, D. Ferrante, F. Gonzalez B. de Quiros

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