Allogeneic hemapoietic progenitor cell collection using four different cell separators: a retrospective comparative analysis - Arat, M; Ö. Arsian; Ayyidiz, E; Tol, M; Ilhan, O (E.S.F.H. 14th congress of the Interdisciplinary European Society for Haemapheresis and Haemotherapy, 2003)