1. Seattle Science Foundation, Seattle, WA, USA.
2. Department of Anatomy, Kurume University School of Medicine, Kurume, Japan.
3. Dental and Oral Medical Center, Kurume University School of Medicine, Kurume, Japan.
4. Swedish Neuroscience Institute, Swedish Medical Center, Seattle, WA, USA.
5. Department of Anatomical Sciences, St. George's University, St. George's, Grenada.