1. Lake Erie College of Osteopathic Medicine, Erie, PA 16509, USA
2. Michigan State University College of Human Medicine, East Lansing, USA
3. Midwestern University College of Osteopathic Medicine, Downers Grove, IL 60515, USA
4. School of Dentistry, University of Michigan, Ann Arbor, USA
5. College of Medicine, University of Rochester, NY, USA
6. Biology Department, Hillsdale College, MI 49242, USA