1. Department of Oral Biology, Indiana University School of Dentistry, 1121 West Michigan Street, Indianapolis, IN 46202-5186;
2. Department of Dentistry, St. Francis Hospital and Medical Center, Hartford, CT 06105
3. School of Dentistry, University of Southern California, Los Angeles, CA 90089-0641
4. Department of Restorative Dentistry, School of Dentistry, University of California at Los Angeles, Los Angeles, CA 90095-1668