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Hassan A, Farouk H, Hassanein F, Abdul-Ghani R.Hassan A, et al.Trans R Soc Trop Med Hyg. 2011 Sep;105(9):519-24. doi: 10.1016/j.trstmh.2011.05.001. Epub 2011 Aug 5.Trans R Soc Trop Med Hyg. 2011.PMID: 21820691