Fig. 1
Center 1 represents Chongqing University Central Hospital. Center 2 represents The Affiliated Hospital of Southwest Medical University. Center 3 represents Chongqing General Hospital
Fig. 1 | BMC Anesthesiology
Center 1 represents Chongqing University Central Hospital. Center 2 represents The Affiliated Hospital of Southwest Medical University. Center 3 represents Chongqing General Hospital