Risk factors for SARS-CoV-2 infection: a test-negative case–control study with additional population controls in Norway by Neil Pearce, Svein Arne Nordbø, Chi Zhang, Anne Kristin Moeller Fell, Johny Kongerud, Yngvar Tveten, Jan Vandenbroucke, Randi Eikeland, Harald Reiso, Marjut Sarjomaa, Hege Kersten, Kristine Karlsrud Berg, Carina Thilesen, Ingeborg S Aaberge

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