[1] Univ Michigan Hlth Syst, Dept Radiat Oncol, Ann Arbor, MI USA
[2] Univ Michigan, Ann Arbor, MI 48109 USA
[3] Univ So Calif, Los Angeles, CA USA
[4] New Jersey State Canc Registry, New Brunswick, NJ USA
[5] Univ Michigan, Sch Med, Ann Arbor, MI USA