Hidayet N.M., Sharaf S.A., Aref S.R., Tawfik T.A. and Moubarak I.I.
Eastern Mediterranean Health Journal 5 ( 2 ): 307 - 319 , 1999
Youssef R.M., Moubarak I.I., Gaffar Y.A. and Atta H.Y.
Eastern Mediterranean Health Journal 8 ( 4 ): 521 - 536 , 2002
Youssef R.M., Moubarak I.I. and Kamel M.I.
Eastern Mediterranean Health Journal 11 ( 1 ): 109 - 118 , 2005
Youssef R.M. and Moubarak I.I.
Eastern Mediterranean Health Journal 8 ( 4 ): 579 - 592 , 2002