1. Section of Cancer Genomics, Genetics Branch; National Cancer Institute; Bethesda MD 20892
2. Department of General, Visceral and Pediatric Surgery; University Medical Center; Göttingen 37075 Germany
3. Department of Medical Statistics; University Medical Center; Göttingen 37075 Germany
4. Division of Cancer Epidemiology and Genetics; National Cancer Institute; Rockville MD 20850
5. Department of Radiation Oncology; University Medical Center; Göttingen 37075 Germany