[1] Univ Texas, MD Anderson Canc Ctr, Dept Neurooncol, Sect Psychiat, Houston, TX 77030 USA
[2] Univ Texas, MD Anderson Canc Ctr, Dept Med Specialties, Sect Gynecol Med Oncol, Houston, TX 77030 USA
[3] Univ Texas, MD Anderson Canc Ctr, Dept Gastrointestinal Med Oncol & Digest Dis, Houston, TX 77030 USA
[4] Houston Vet Affairs Med Ctr, Dept Med, Houston Ctr Qual Care & Utilizat Studies, Houston, TX USA
[5] Baylor Coll Med, Dept Med, Sect Hlth Serv Res, Houston, TX 77030 USA
[6] Univ Texas, MD Anderson Canc Ctr, Div Med, Houston, TX 77030 USA
[7] Bayer Inst Hlth Care Commun, West Haven, CT USA
[8] Med Coll Penn & Hahnemann Univ, Dept Med, Div Med Educ, Philadelphia, PA USA