Seroprevalence of Antibodies against SARS-CoV-2 among the Personnel and Students of the National and Kapodistrian University of Athens, Greece: A Preliminary Report oleh Ourania E. Tsitsilonis, Dimitrios Paraskevis, Evi Lianidou, Vassilios Pierros, Athanasios Akalestos, Efstathios Kastritis, Paraskevi Moutsatsou, Andreas Scorilas, Thomas Sphicopoulos, Evangelos Terpos, Nikolaos Thomaidis, Athanassios Tsakris, Nikolaos Voulgaris, Christina C. Daskalaki, Zoi Evangelakou, Christina Fouki, Despoina D. Gianniou, Sentiljana Gumeni, Evangelia-Georgia Kostaki, Ioannis V. Kostopoulos, Maria S. Manola, Nikolaos Orologas-Stavrou, Chrysanthi Panteli, Eleni-Dimitra Papanagnou, Pantelis Rousakis, Aimilia D. Sklirou, Stavroula Smilkou, Dimitra Stergiopoulou, Ioannis P. Trougakos, Soritios Tsiodras, Petros P. Sfikakis, Meletios-Athanasios Dimopoulos