Safety and Immunogenicity of SARS-CoV-2 mRNA Vaccine Booster Doses in Kidney Transplant Recipients: Results of a 12-mo Follow-up From a Prospective Observational Study oleh Vojtech Petr, MD, Ivan Zahradka, MD, Istvan Modos, PhD, Matej Roder, MSc, Martina Fialova, MSc, Jana Machkova, MSc, Katerina Kabrtova, MSc, Petra Hruba, PhD, Maria Magicova, MD, Antonij Slavcev, MD, PhD, Ilja Striz, MD, PhD, Ondrej Viklicky, MD, PhD