5National Committee for Clinical Laboratory Standards. Reference leukocyte differential count(proportional) and evaluation of instrument methods:approved standard.NCCLS Document H20-A[S]. NCCLS, Wayne(USA), 1992.
6Novis DA,Walsh M,Wilkinson D,et al. Laboratory productivity and the rate of manual peripheral blood smear review:a college of American Pathologists Q-Probes study of 95,14l complete blood count determinations performed in 263 institutions[J].Arch Pathol Lab Med, 2006, 130(5):596-601.