Institution: | (1) WHO Collaborating Center for Drug Information, Universiti Sains Malaysia, 11800 USM, Minden, Pulau Pinang, Malaysia;(2) Department of Research, Ministry of Health—Khartoum State, P.O. Box 1517, Khartoum, Sudan;(3) General Directorate of Pharmacy, Ministry of Health—Khartoum State, P.O. Box 1517, Khartoum, Sudan |