1. Laboratory of Epidemiology Radioprotection and Nuclear Safety Institute Fontenay aux Roses France
2. Radiation Epidemiology Branch, Division of Cancer Epidemiology and Genetics National Cancer Institute Bethesda Maryland
3. Surveillance Research Program, Division of Cancer Control and Population Sciences National Cancer Institute Bethesda Maryland
4. Infections and Immunoepidemiology Branch, Division of Cancer Epidemiology and Genetics National Cancer Institute Bethesda Maryland