Tachycardia as an undescribed adverse effect to the Comirnaty© vaccine (BNT162b2 Pfizer-BioNTech Covid-19 vaccine): Description of 3 cases with a history of SARS-CoV-2 disease M. Teresa Marco García; Álvaro Torres Lana; M. Berta Anta Agudo; M. de la Trinidad Rufino Delgado;