1. Oncology Center, The Johns Hopkins University School of Medicine, Baltimore, MD 21231.
2. Department of Pathology and the Oncology Center, The Johns Hopkins Medical Institutions, Baltimore, MD 21205.
3. Department of Surgery, M. D. Anderson Hospital, Houston, TX 77030.
4. Institute for Molecular Genetics, Baylor College of Medicine, Houston, TX 77030.
5. Department of Medical Informatics, University of Utah Medical Center, Salt Lake City, UT 84108.
6. Department of Human Genetics and Howard Hughes Medical Institute, University of Utah Medical Center, Salt Lake City, UT 84132.