Dr. Manar E. Abdel-Rahman Associate Professor of Biostatistics
Department of Statistics
Faculty of Mathematical Sciences
University of Khartoum, Sudan
Email: manarr@hotmail.com; manar@uofk.edu

Abdalaziz TangasawiAssociate Professor of Statistical Sciences
Department of Statistics
Faculty of Mathematical Sciences
University of Khartoum, Sudan
Email: atangasawi@yahoo.com