[1] VA Greater Los Angeles Healthcare Syst, Los Angeles, CA USA
[2] Thomas Jefferson Univ, Dept Radiat Oncol, Sidney Kimmel Med Coll, Philadelphia, PA USA
[3] Thomas Jefferson Univ, Ctr Canc, Philadelphia, PA USA
[4] Vet Affairs Ann Arbor Hlth Syst, Dept Radiat Oncol, Ann Arbor, MI USA
[5] Stanford Univ, Dept Radiat Oncol, Sch Med, Palo Alto, CA USA
[6] Emory Univ, Dept Radiat Oncol, Winship Canc Inst, Atlanta, OH USA
[7] Atlanta Vet Affairs Hlth Care Syst, Decatur, GA USA
[8] Emory Univ, Winship Canc Inst, Atlanta, GA USA
[9] Vet Hlth Adm Tennessee Valley Healthcare Syst, Nashville, TN USA
[10] Durham VA Hlth Care Syst, Cooperat Studies Program Epidemiol Ctr, Durham, NC USA
[11] Oregon Hlth & Sci Univ, Dept Pulmonol, Portland, OR USA
[12] VA Portland Healthcare Syst, Ctr Improve Veteran Involvement Care, Portland, OR USA
[13] Emory Univ, Dept Radiat Oncol, Winship Canc Inst, Atlanta, GA USA