1 Departments of Internal Medicine and Surgery (H.N.) and Division of Orthopaedics and Rehabilitation (T.H.T and K.J.S.), P.O. Box 19679, Southern Illinois University School of Medicine, Springfield, IL 62794-9679. E-mail address for K.J. Saleh: ksaleh@siued.edu.
2 Harvard Business School, Harvard University, Morgan Hall, Room 439, Boston, MA 02163.
3 Department of Orthopaedic Surgery, University of California, San Francisco, 500 Parnassus Avenue, MU 320W, San Francisco, CA 94158-0728.