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Audifax N. Iwu, C.S. Ebere, I.P. Ogbuewu, I.F. Etuk, M.N. Opara, M.C. Uchegbu, I.C. Okoli, F.C. Iheukwumere and U. Herbert
Journal of Medical Sciences 13 ( 7 ): 563 - 570 , 2013