An international observational study to assess the impact of the Omicron variant emergence on the clinical epidemiology of COVID-19 in hospitalised patients. by Gonçalves, BP, Hall, M, Jassat, W, Balan, V, Murthy, S, Kartsonaki, C, Semple, MG, Rojek, A, Baruch, J, Reyes, LF, Dasgupta, A, Dunning, J, Citarella, BW, Pritchard, M, Martín-Quiros, A, Sili, U, Baillie, JK, Aryal, D, Arabi, Y, Rashan, A, Angheben, A, Caoili, J, Carrier, FM, Harrison, EM, Gómez-Junyent, J, Figueiredo-Mello, C, Douglas, JJ, Mat Nor, MB, Chow, YP, Wong, XC, Bertagnolio, S, Thwin, SS, Streinu-Cercel, A, Salazar, L, Rishu, A, Rangappa, R, Ong, DSY, Hashmi, M, Carson, G, Diaz, J, Fowler, R, Kraemer, MUG, Wils, E-J, Horby, P, Merson, L, Olliaro, PL