Acute onset supraclavicular lymphadenopathy coinciding with intramuscular mRNA vaccination against COVID-19 may be related to vaccine injection technique, Spain, January and February 2021 Fernández-Prada, María and Rivero-Calle, Irene and Calvache-González, Ana and Martinón-Torres, Federico, Eurosurveillance, 26, 2100193 (2021), https://doi.org/10.2807/1560-7917.ES.2021.26.10.2100193