1. Division of Hematology and Oncology, Fletcher Allen Health Care/University of Vermont College of Medicine, Burlington, Vermont.
2. Department of Investigational Cancer Therapeutics, The University of Texas M. D. Anderson Cancer Center, Houston, Texas.
3. Department of Palliative Care and Rehabilitation Medicine, The University of Texas M. D. Anderson Cancer Center, Houston, Texas.
4. Department of Biostatistics, The University of Texas M. D. Anderson Cancer Center, Houston, Texas.
5. Department of General Internal Medicine, The University of Texas M. D. Anderson Cancer Center, Houston, Texas.