1. Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis
2. Department of Anatomical Sciences and Neurobiology, University of Louisville, Louisville, Kentucky
3. Department of Otolaryngology, Indiana University School of Medicine, Indianapolis
4. Research and Development Service, Richard L. Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana
5. Department of Biomedical and Applied Sciences, Indiana University School of Dentistry, Indianapolis