1. Kellogg School of Management, Northwestern University, 2001 Sheridan Road, Evanston, IL 60208 (e-mail: )
2. Wharton School, University of Pennsylvania, 3620 Locust Walk, Philadelphia, PA 19104 (e-mail: )
3. Tepper School of Business, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213 (e-mail: )