Adverse perinatal outcomes in gestational diabetes mellitus with and without SARS-CoV-2 infection during pregnancy: results from two nationwide registries in Germany oleh Wolfgang Lieb, Katharina S Weber, Tanja Groten, Mario Rüdiger, Ulrich Pecks, Babett Ramsauer, Heinke Adamczewski, Dietmar Weber, Tatjana P Liedtke, Ute M Schaefer-Graf, Eike A Strathmann, Helmut J Kleinwechter