A. Hussein - University of Khartoum
M. Gadour - Daoud Research Group, Khartoum, Sudan
F. Yassien - University of Science and Technology Omdurman
A. Ali - Daoud Research Group, Khartoum, Sudan
O. El-adil - International University of Africa
A. Hamad - Daoud Research Group, Khartoum, Sudan
A. Siddig - Al-Neelain University
E. Mahmoud - Daoud Research Group, Khartoum, Sudan
M. Malk Aldar - Jazan Teaching Hospital, Department of Neurology, Jazan, Saudi Arabia
M. Ahmed - Daoud Research Group, Khartoum, Sudan