Point-of-care lung ultrasound in COVID-19 patients: inter- and intra-observer agreement in a prospective observational study oleh Markus H. Lerchbaumer, Jonathan H. Lauryn, Ulrike Bachmann, Philipp Enghard, Thomas Fischer, Jana Grune, Niklas Hegemann, Dmytro Khadzhynov, Jan Matthias Kruse, Lukas J. Lehner, Tobias Lindner, Timur Oezkan, Daniel Zickler, Wolfgang M. Kuebler, Bernd Hamm, Kai-Uwe Eckardt, Frédéric Muench