[1] Cedars Sinai Med Ctr, Dept Anaesthesia, Los Angeles, CA 90048 USA
[2] Cedars Sinai Med Ctr, Dept Thorac Anaesthesia, Dept Anaesthesia, Los Angeles, CA 90048 USA
[3] Cedars Sinai Med Ctr, Dept Reg Anaesthesia & Acute Pain Serv, Dept Anaesthesia, Los Angeles, CA 90048 USA
[4] Cedars Sinai Med Ctr, Dept Trauma Anaesthesia, Dept Anaesthesia, Los Angeles, CA USA