1. Johns Hopkins Oncology Center, Baltimore, MD 21231, USA.
2. Human Genome Sciences, Inc., Rockville, MD 20850-3338, USA.
3. Institute for Genomic Research, Gaithersburg, MD 20878, USA.
4. Departments of Pathology and Oncology, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
5. Department of Epidemiology, The Johns Hopkins University School of Public Health and Hygiene, Baltimore, MD 21205, USA.
6. Departments of Preventive Medicine and Public Health, Creighton University School of Medicine, Omaha, NE 68178, USA.
7. Department of Medical Genetics, University of Helsinki, 00290 Helsinki, Finland.