1. Department of Periodontology,
2. Department of Pediatric Dentistry,
3. College of Dentistry,
4. Department of Oral Biology, College of Dentistry, and
5. Division of Epidemiology and Biometrics, School of Public Health, College of Medicine and Public Health, The Ohio State University, 305 W. 12th Ave., PO Box 182357, Columbus, OH 43218-2357;