[1] UNIV MINNESOTA, SCH MED, DEPT MED, MED ONCOL SECT, MINNEAPOLIS, MN 55455 USA
[2] UNIV MINNESOTA, SCH MED, DEPT UROL SURG, MINNEAPOLIS, MN 55455 USA
[3] UNIV MINNESOTA, SCH MED, DEPT PATHOL & LAB MED, DIV SURG PATHOL, MINNEAPOLIS, MN 55455 USA
[4] UNIV MINNESOTA, SCH PUBL HLTH, DIV BIOMETRY, MINNEAPOLIS, MN 55455 USA