[1] Univ Minnesota, Ctr Canc, Minneapolis, MN USA
[2] Univ Minnesota, Dept Pediat, Minneapolis, MN 55455 USA
[3] Univ Minnesota, Vet Diagnost Lab, St Paul, MN 55108 USA
[4] Univ Minnesota, Canc Ctr Histopathol, St Paul, MN 55108 USA
[5] Univ Minnesota, Dept Lab Med & Pathol, Minneapolis, MN 55455 USA