V.A. Onwuliri, S. Bitrus, F. Puppet and H.C.C. Maduka
Journal of Medical Sciences 4 ( 3 ): 221 - 224 , 2004
F.O. Obi, H.C.C. Maduka and I. Zubairu
Journal of Medical Sciences 3 ( 2 ): 157 - 162 , 2003