[1] Ostfold Hosp Trust, Cenetre Lab Med, Fredrikstad, Norway
[2] Weill Cornell Med Coll, Dept Pediat, Unit Platelet Disorders, New York, NY USA
[3] Univ Hosp, Internal Med Res Inst, Oslo, Norway
[4] Univ Hosp, Dept Hematol, Oslo, Norway
[5] Norris Canc Hosp & Res Inst, Dept Med, Los Angeles, CA USA
[6] Univ Hosp, Inst Clin Med, Oslo, Norway
[7] Ostfold Hosp Trust, Dept Med, Fredrikstad, Norway