[1] Univ Med Ctr Utrecht, Cent Diagnost Lab Res, Utrecht, Netherlands
[2] Univ Med Ctr Utrecht, Van Creveldklin, Ctr Benign Hematol Thrombosis & Hemostasis, Utrecht, Netherlands
[3] Childrens Hosp Oakland, Res Inst, Oakland, CA 94609 USA
[4] Erasmus MC, Dept Hematol, Rotterdam, Netherlands