Comparative analysis of post-transplant lymphoproliferative disorders after solid organ and hematopoietic stem cell transplantation reveals differences in the tumor microenvironment. - Overkamp M; Granai M; Bonzheim I; Steinhilber J; Schittenhelm J; Bethge W; Quintanilla-Martinez L; Fend F; Federmann B (Virchows Archiv : an international journal of pathology, 2021)