“…Ten studies [ 36 , 87 , 88 , 93–95 , 97 , 98 , 100 , 103 ] were rated as having a serious risk of bias, while ten studies [ 37 , 38 , 89–92 , 96 , 99 , 101 , 102 ] were rated as having a critical risk of bias. Five studies [ 36 , 38 , 89 , 90 , 103 ] were rated as having a serious risk of bias due to confounding factors, while one study [ 37 ] was rated as having a critical risk of bias due to either a lack of reporting for important patient characteristics (e.g., disease severity) or an imbalance in the reported patient characteristics. In terms of risk of bias due to selection of participants, three studies [ 38 , 92 , 103 ] were rated as having a serious risk of bias due to suspected selection bias, such as only including discharged patients in retrospective analyses.…”