[1] Univ Childrens Hosp, Pediat Hematol & Oncol, Munster, Germany
[2] Hannover Med Sch, Pediat Hematol & Oncol, Hannover, Germany
[3] Univ Kiel, Hematopathol Sect, Pathol, Campus Kiel, Kiel, Germany
[4] Univ Kiel, Lymph Node Registry, Campus Kiel, Kiel, Germany
[5] Univ Hosp Schleswig Holstein, Campus Kiel, Kiel, Germany