A rationale for positive selection of peripheral blood stem cells in multiple myeloma: highly purified CD34+ cell fractions of leukapheresis products do not contain malignant cells - Cremer, Friedrich Walter; Kiel, Katja; Sucker, Christoph; Wacker, Jörg; Atzberger, A.; Haas, Rainer; Goldschmidt, Hartmut; Moos, Marion (Leukemia, 1997)