Intravenous IgM-enriched immunoglobulins in critical COVID-19: a multicentre propensity-weighted cohort study oleh Tim Rahmel, Felix Kraft, Helge Haberl, Ute Achtzehn, Timo Brandenburger, Holger Neb, Dominik Jarczak, Maximilian Dietrich, Harry Magunia, Frieda Zimmer, Jale Basten, Claudia Landgraf, Thea Koch, Kai Zacharowski, Markus A. Weigand, Peter Rosenberger, Roman Ullrich, Patrick Meybohm, Axel Nierhaus, Detlef Kindgen-Milles, Nina Timmesfeld, Michael Adamzik