Robert W Weisberg1, Rebecca M Speck2, Lee A Fleisher3. 1. Department of Psychology, Temple University, Weiss Hall, Philadelphia, PA 19122, United States. Electronic address: weisberg@temple.edu. 2. Department of Anesthesiology and Critical Care, University of Pennsylvania, 423 Guardian Drive, 1121A Blockley Hall, Philadelphia, PA 19104-6021, United States. Electronic address: speckr@mail.med.upenn.edu. 3. Department of Anesthesiology and Critical Care, University of Pennsylvania, 3400 Spruce Street, Dulles 680, Philadelphia, PA 19104, United States. Electronic address: lee.fleisher@uphs.upenn.edu.