Comparison of the Course of SARS-CoV-2 Infection in Left Ventricular Assist Device Recipients Implanted Before and During COVID-19 PandemicSylwia Wisniowska-Smialek,Pawel Rubis,Grzegorz Wasilewski,Izabela Gorkiewicz-Kot,Michal Kaleta,Liza Vashchelina,Irena Milaniak,Ewa Dziewiecka, Ferdynanda Krupa-Hubner,Paulina Tomsia,Rafal Drwila,Hubert Hymczak,Dorota Sobczyk,Boguslaw Kapelak,Karol Wierzbicki