1. Department of Radiation Oncology, Mayo Clinic, 200 2nd Street SW, Rochester, MN 55905, USA
2. QST Hospital, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inageku, Chiba 263-8555, Japan
3. Department of Statistics, Mayo Clinic, 200 2nd Street SW, Rochester, MN 55905, USA
4. Division of Medical Oncology, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA
5. Division of Colon & Rectal Surgery, Mayo Clinic, 200 2nd Street SW, Rochester, MN 55905, USA