1. Department of Diagnostic and Biological Sciences; University of Minnesota School of Dentistry; Minneapolis; MN; USA
2. Minnesota Dental Research Center for Biomaterials and Biomechanics; University of Minnesota School of Dentistry; Minneapolis; MN; USA
3. Department of Developmental and Surgical Sciences; University of Minnesota School of Dentistry; Minneapolis; MN; USA
4. Division of Biostatistics; University of Minnesota School of Public Health; Minneapolis; MN; USA