[1] Univ Tennessee, Ctr Hlth Sci, West Canc Ctr, Dept Radiat Oncol, Memphis, TN 38163 USA
[2] Univ Tennessee, Ctr Hlth Sci, Dept Prevent Med, Memphis, TN 38163 USA
[3] Univ Memphis, Sch Publ Hlth, Memphis, TN 38152 USA
[4] Univ Nebraska Med Ctr, Dept Radiat Oncol, Omaha, NE USA
[5] Univ Tennessee, Ctr Hlth Sci, Dept Prevent Med, Memphis, TN 38163 USA
[6] Univ Tennessee, Ctr Hlth Sci, West Canc Ctr, Dept Hematol Oncol, Memphis, TN 38163 USA
[7] Univ Tennessee, Ctr Hlth Sci, West Canc Ctr, Memphis, TN 38163 USA