1. Department of Biomedical Engineering, University of Michigan College of Engineering and Medical School, Ann Arbor, Michigan.
2. Department of Oral and Maxillofacial Surgery, University of Michigan School of Dentistry, Ann Arbor, Michigan.
3. Center for Statistical Consultation and Research, University of Michigan School of Public Health, Ann Arbor, Michigan.
4. Department of Surgery, University of Michigan Medical School, Ann Arbor, Michigan.