Risk factors for severe COVID‐19 in hospitalized sickle cell disease patients: A study of 319 patients in France. Issue 3 (18th December 2021) - Arlet, Jean‐Benoît; Lionnet, François; Khimoud, Djamal; Joseph, Laure; de Montalembert, Mariane; Morisset, Stéphane; Garou, Alain; Cannas, Giovanna; Cougoul, Pierre; Guitton, Corinne; Holvoet, Laurent; Odièvre, Marie‐Hélène; et al.