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Eastern Mediterranean Health Journal 3 ( 2 ): 322 - 335 , 1997
Morsi M.G., Youssef R.M. and Khalil Y.M.
Eastern Mediterranean Health Journal 3 ( 3 ): 480 - 492 , 1997
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Eastern Mediterranean Health Journal 5 ( 1 ): 71 - 78 , 1999