1. Department of Community and Preventive Dentistry, Creighton University, School of Dentistry, Omaha, Nebraska
2. Oral and Maxillofacial Pathology and Pediatric Dentistry, Department of Stomatology, University of Texas at Houston Health Science Center Dental Branch, Houston, Texas
3. Department of Pathology, School of Medicine, The University of Utah, Salt Lake City, Utah
4. Department of Pathology, Baylor College of Medicine and Texas Children's Hospital, and Department of Pediatric Dentistry, University of Texas at Houston Health Science Center Dental Branch, Houston, Texas