1. Department of Diagnostic Radiology, MD Anderson Cancer Center, 1400 Pressler St, Unit 1473, Houston, TX 77030
2. Department of Radiology, Northwestern University, Chicago, IL
3. Department of Pathology, MD Anderson Cancer Center, Houston, TX
4. Department of Colon and Rectal Surgery, MD Anderson Cancer Center, Houston, TX
5. Department of Radiation Oncology, Mayo Clinic, Jacksonville, FL