1. Department of Surgical Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas.
2. Department of Pathology, University of Texas MD Anderson Cancer Center, Houston, Texas.
3. Department of Epidemiology, University of Texas MD Anderson Cancer Center, Houston, Texas.
4. Department of Endocrine Neoplasia and Hormonal Disorders, University of Texas MD Anderson Cancer Center, Houston, Texas.
5. Department of Biostatistics, University of Texas MD Anderson Cancer Center, Houston, Texas.