1. Department of Anatomy, Physiology and Genetics, Uniformed Services University of the Health Sciences, Bethesda, Maryland.
2. Center for Devices and Radiological Health, Office of Science and Technology, Food and Drug Administration, Rockville, Maryland.
3. Center for Devices and Radiological Health, Division of Physics, Food and Drug Administration, Rockville, Maryland.
4. Specialization School of General Surgery, University of Siena, Siena, Italy.
5. Department of Human Pathology and Oncology, Section of Pathological Anatomy, University of Siena, Siena, Italy.
6. F. Edward Hébert School of Medicine, Uniformed Services University of the Health Sciences, Bethesda, Maryland.