1. Department of Epidemiology; New England Research Institutes; Watertown MA USA
2. Department of Clinical Epidemiology; Aarhus University Hospital; Aarhus N Denmark
3. Discipline of Medicine; University of Adelaide; Australia
4. Lank Center for Genitourinary Oncology; Dana-Farber Cancer Institute, Harvard Medical School; Boston MA USA
5. Department of Urology; Queen's University; ON Canada