M Sundin, K Le Blanc, O Ringden, L Barkholt, B Omazic, C Lergin, V Levitsky, M Remberger. The role of HLA mismatch, splenectomy and recipient Epstein-Barr virus seronegativity as risk factors in post-transplant lymphoproliferative disorder following allogeneic hematopoietic stem cell transplantation. Haematologica 2006; 91(8):1059-1067.