Linda M Kaste1, Leslie R Halpern2. 1. Department of Pediatric Dentistry, College of Dentistry, University of Illinois at Chicago, 801 South Paulina Street, MC 850, Room 563A, Chicago, IL 60612, USA. Electronic address: kaste@uic.edu. 2. Department of Oral and Maxillofacial Surgery, Meharry Medical College, School of Dentistry, 1005 DB Todd Jr Boulevard, Nashville, TN 37208, USA. Electronic address: lhalpern@mmc.edu.