1. Department of Anesthesiology and Perioperative Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas
2. Anesthesiology and Surgical Oncology Research Group, Houston, Texas
3. Department of Anesthesiology, Massachusetts General Hospital, Harvard University, Boston, Massachusetts
4. University of Texas McGovern Medical School, Houston, Texas, USA
5. Department of Pain Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas
6. Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, Texas
7. Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, Texas