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Kolarić, Branko; Ambriović Ristov, Andreja; Tabain, Irena; Vilibić-Čavlek, Tatjana (2021) Waning immunity six months after BioNTech/Pfizer COVID-19 vaccination among nursing home residents in Zagreb, Croatia. Croatian Medical Journal, 62 (6). pp. 630-633. ISSN 0353-9504