作者单位：Department of Surgery, ?rebro University Hospital, ?rebro University, ?rebro, Sweden[1]Department of Anesthesia and Intensive Care, ?rebro University Hospital, ?rebro University, ?rebro[2]Clinical Epidemiology and Biostatistics Unit, ?rebro University Hospital, ?rebro University, ?rebro[3]Department of Cardio-Thoracic and Vascular Surgery, ?rebro University Hospital, ?rebro University[4]
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