1. Department of Pathology, Instituto Nacional de Ciencias Médicas y Nutrición “Salvador Zubirán,” Mexico City, Mexico
2. Department of Pathology, Medica Sur Clinic and Foundation, Mexico City, Mexico
3. Department of Pathology, University Hospital of the University of Minnesota, Minneapolis
4. Department of Surgery, Medica Sur Clinic and Foundation, and Instituto Nacional de Ciencias Médicas y Nutrición “Salvador Zubirán,” Mexico City, Mexico
5. George Washington University Cancer Institute, Washington, DC