“…1 ). Eventually, 36 studies were included in the present systematic review and 28 were incorporated in the meta-analysis [ 7 , 9 , 11 , [13] , [14] , [15] , [16] , 19 , 20 , 23 , [28] , [29] , [30] , [31] , [32] , [33] , [34] , [35] , [36] , [37] , [38] , [39] , [40] , [41] , [42] , [43] , [44] , [45] , [46] , [47] , [48] , [49] , [50] , [51] , [52] , [53] , [54] ]. Overall, 28 articles were included in phase 1 to determine risk factors and outcome of readmitted COVID-19 patients, and 19 articles were included in phase 2 to determine the cause of readmissions.…”