[1] UNIV MINNESOTA,DEPT INTERN MED,MAYO CLIN & MAYO GRAD SCH,ROCHESTER,MN 55901
[2] UNIV MINNESOTA,DEPT SURG,MAYO CLIN & MAYO GRAD SCH,ROCHESTER,MN 55901
[3] UNIV MINNESOTA,DEPT EPIDEMIOL & BIOSTATISTICS,MAYO CLIN & MAYO GRADSCH,ROCHESTER,MN 55901
[4] UNIV MINNESOTA,DEPT EXPTL & ANAT PATHOL,MAYO CLIN & MAYO GRAD SCH,ROCHESTER,MN 55901