1. Department of Biologic and Materials Sciences
2. Department of Orthodontics and Pediatric Dentistry, University of Michigan School of Dentistry, 1011 N. University, Ann Arbor, MI 48109-1078, USA
3. Université de Montréal, Faculté de médecine dentaire, Pavillon Roger-Gaudry, Room A-221, 2900 Blvd. Édouard-Montpetit, Montréal, QC, Canada H3T 1J4, and McGill University, Faculty of Dentistry, Montreal QC H3A 2B2
4. University of Michigan Museum of Paleontology, 1529 Ruthven, Ann Arbor MI 48109-1079, USA