Incidence and predictors of COVID-19 and flares in patients with rare autoimmune diseases: a systematic survey and serological study at a national reference center in France by Renaud Felten, Marc Scherlinger, Aurélien Guffroy, Vincent Poindron, Alain Meyer, Margherita Giannini, Anne-Sophie Korganow, Christelle Sordet, Emmanuel Chatelus, Rose-Marie Javier, Aurore Meyer, Luc Pijnenburg, Jean-François Kleinmann, Jacques-Eric Gottenberg, Jean Sibilia, Thierry Martin, Laurent Arnaud

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