Lower serum alpha 1 antitrypsin levels in patients with severe COVID-19 compared with patients hospitalized due to non-COVID-19 pneumonia. - Pertzov, Barak; Shapira, Guy; Abushkara, Simon; Cohen, Sharon; Turjeman, Adi; Kramer, Mordechai R.; Gurwitz, David; Shomron, Noam (Infectious Diseases, 2022)