[1] Mayo Clin, Dept Cardiovasc Med, 200 1st St SW, Rochester, MN 55905 USA
[2] Mayo Clin, Dept Internal Med, 200 1st St SW, Rochester, MN 55905 USA
[3] Mayo Clin, Dept Radiat Oncol, 200 1st St SW, Rochester, MN 55905 USA
[4] Univ Texas MD Anderson Canc Ctr, Dept Pathol, 1515 Holcombe Blvd, Houston, TX 77030 USA
[5] Univ Texas MD Anderson Canc Ctr, Dept Radiat Oncol, 1515 Holcombe Blvd, Houston, TX 77030 USA
[6] Mayo Clin, Dept Radiol, 200 1st St SW, Rochester, MN 55905 USA