[1] UNIV WISCONSIN, SCH MED, DEPT MED, MADISON, WI USA
[2] UNIV WISCONSIN, SCH MED, DEPT BIOSTAT, MADISON, WI USA
[3] UNIV WISCONSIN, SCH MED, DEPT ONCOL, MADISON, WI USA
[4] UNIV WISCONSIN, SCH MED, DEPT GENET, MADISON, WI USA
[5] WILLIAM S MIDDLETON MEM VET ADM MED CTR, PATHOL & LAB MED SERV, MADISON, WI 53705 USA