Pre-analytical parameters associated with unsuccessful karyotyping in myeloid neoplasm: a study of 421 samples oleh M.F.M. Santos, F.C.A.C. Oliveira, R.K. Kishimoto, D. Borri, F.P.S. Santos, P.V. Campregher, P.A.A. Silveira, N. Hamerschlak, C.L.P. Mangueira, F.B. Duarte, A.H. Crepaldi, M.A. Salvino, E.D.R.P. Velloso