[1] Mayo Clin, Coll Med, Div Hematopathol, Rochester, MN 55905 USA
[2] Dartmouth Coll, Hanover, NH USA
[3] Wellesley Coll, Wellesley, MA USA
[4] Univ Notre Dame, Coll Sci, Notre Dame, IN 46556 USA
[5] Univ Nebraska, Sch Med, Omaha, NE 68198 USA
[6] Mayo Clin, Coll Med, Div Hematol, Rochester, MN USA