1. Department of Neurosurgery, Neurosurgical Institute, Grand Blanc, MI, USA
2. Department of Surgery and Trauma, Ascension Genesys Hospital, Genesys Trauma Services, Grand Blanc, MI, USA
3. Department of Medical Education, College of Osteopathic Medicine, Michigan State University, East Lansing, MI, USA
4. Department of Research, Ascension Genesys Hospital, Grand Blanc, MI, USA