Hsieh Tyken C, Schiller Nelson B, Joshi Ravi V
Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco, CA, USA.
Anesth Analg. 2010 Mar 1;110(3):725-6; discussion 727. doi: 10.1213/ANE.0b013e3181cbd709.