1. Campbell University, Jerry M. Wallace School of Osteopathic Medicine, P.O. Box, Buies Creek, NC 27506, USA
2. Neurology Department, Gundersen Health System, 1900 South Avenue, La Crosse, WI 54601, USA
3. Department of Anatomy, Campbell University, Jerry M. Wallace School of Osteopathic Medicine, P.O. Box 4280, Buies Creek, NC 27506, USA
4. Department of Microbiology and Immunology, Campbell University, Jerry M. Wallace School of Osteopathic Medicine, P.O. Box 4280, Buies Creek, NC 27506, USA