Risk factors associated with day-30 mortality in patients over 60 years old admitted in ICU for severe COVID-19: the Senior-COVID-Rea Multicentre Survey protocol oleh Thomas Rimmele, Julien Berthiller, Anne-Claire Lukaszewicz, Laurent Jallades, Jean-Baptiste Pialat, Céline Monard, Christophe Leroy, Vincent Collange, Arnaud Friggeri, Mélanie Roche, Christine Ravot, Amélie Malapert, Max Haïne, David Dayde, Claire Falandry, Marie Simon, Céline Guichon, Paul Abraham, Camille Boin, Justine Dubreuil, Laurent Bitker, Baptiste Balança, Sylvie Goutte, Emilie Gadea, Alain Lepape, Fabrice Thiollière, Hodane Yonis, Antoine Garnier-Crussard, Loredana Baboi, Valérie Cerro, Carlos El Khoury, Emilie Gadéa-Deschamps, Marie-Catherine Fromont, Audrey Gelot, Anthéa Loïez, Maya Perrou, Laetitia Paradisi-Prieur, Marion Provent, Gulsum Sahin, Ghyslaine Thao, Marine Thieux