- Correspondence to Professor Magda Elhadi Ahmed, Department of Community Medicine, Faculty of Medicine, University of Gezira, P.O. Box 20 Wad Madani, Gezira State, Sudan;
- Received May 13, 2013
- Revised August 2, 2013
- Accepted August 8, 2013
- First published August 30, 2013.
Arabic Abstract translation
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