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Petruzzi, Massimo; Galleggiante, Sara; Messina, Sabrina; Della Vella, Fedora (2022). Oral erythema multiforme after Pfizer-BioNTech COVID-19 vaccination: a report of four cases. BMC Oral Health, 22(1), p. 90. BioMed Central 10.1186/s12903-022-02124-2