1. Department of Palliative Care and Rehabilitation Medicine, The University of Texas M. D. Anderson Cancer Center, Houston, Texas.
2. Department of Pharmacy, The University of Texas M. D. Anderson Cancer Center, Houston, Texas.
3. Department of Biostatistics, The University of Texas M. D. Anderson Cancer Center, Houston, Texas.
4. Department of Genitourinary Medical Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas.