1. Department of Oral Biology, College of Dentistry, University of Nebraska Medical Center, Lincoln, NE.
2. Department of Pharmaceutical Sciences, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE.
3. Department of Biostatistics, College of Public Health, University of Nebraska Medical Center, Omaha, NE.
4. Department of Surgical Specialties, College of Dentistry, University of Nebraska Medical Center.