1. Department of Biostatistics; University of Michigan; Ann Arbor Michigan 48109 U.S.A.
2. Zentrum Mathematik; Technische Universitaet Muenchen; Munich 85748 Germany
3. Department of Epidemiology/Biostatistics and Urology; University of Texas Health Science Center at San Antonio; San Antonio Texas 78229 U.S.A.
4. INSERM, U897; Epidemiology and Biostatistics Research Center; 33076 Bordeaux France
5. Division of Radiation Oncology; Peter MacCallum Cancer Centre; Melbourne Victoria 3002 Australia
6. Michigan Healthcare Professionals/21st Century Oncology; Farmington Hills Michigan 48334 U.S.A.
7. Novartis Pharmaceuticals Corporation; Florham Park NJ 07932 U.S.A.
8. British Columbia Cancer Agency; Vancouver British Columbia V5Z 4E6 Canada
9. Department of Radiation Oncology; Cedars-Sinai Medical Center; Los Angeles California 90048 U.S.A.