1. Department of Vascular Surgery, Palermo Clinic, Bogota Vascular Clinic, Bogota, Colombia
2. Department of Pathology, University of Santander, Bucaramanga, Colombia
3. Department of Pathology, University of California, San Diego, La Jolla, CA, USA
4. Department of Pathology, National Institute of Cancer, Bogota, Colombia
5. Department of Pathology, National University of Colombia, Bogota, Colombia