Department of Anesthesiology, University of Michigan Medical School, Ann Arbor, Michigan, United States of America.|Department of Anesthesiology and Center for Consciousness Science, University of Michigan Medical School, Ann Arbor, Michigan, United States of America.|Department of Anesthesiology, University of Michigan Medical School, Ann Arbor, Michigan, United States of America.|Department of Anesthesiology, Center for Consciousness Science and Neuroscience Graduate Program, University of Michigan Medical School, Ann Arbor, Michigan, United States of America.