[1] Univ Med Ctr Gottingen, Inst Cellular & Mol Immunol, Gottingen, Germany
[2] Med Univ Graz, Div Haematol, Graz, Austria
[3] Univ Hosp Regensburg, Dept Internal Med 3, Regensburg, Germany
[4] Newcastle Univ, Inst Cellular Med, Hematol Sci, Newcastle Upon Tyne, Tyne & Wear, England