1. From the Division of Cancer Epidemiology and Genetics, Viral Epidemiology Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland; the
2. Departments of Obstetrics and Gynecology and Medicine, State University of New York Health Science Center at Brooklyn, Brooklyn, New York; the
3. Science Application International Corporation, Frederick Cancer Research Center, Frederick, Maryland; the
4. Department of Hygiene and Epidemiology, Athens University and Medical School, Athens, Greece; the
5. Department of Pediatrics, Walter Reed Army Medical Center, Washington, District of Columbia; the
6. Department of Pediatrics, Albert Einstein College of Medicine, Bronx, New York; and the
7. Department of Medicine, St Louis University School of Medicine, St Louis, Missouri.