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Abdullah MA, Ashong EF, Al Habib SA, Karrar ZA, Al Jishi NM.Abdullah MA, et al. Among authors: karrar za.Ann Trop Paediatr. 1987 Sep;7(3):194-9. doi: 10.1080/02724936.1987.11748506.Ann Trop Paediatr. 1987.PMID: 2445269
Taha SA, Karrar ZA, Dost SM.Taha SA, et al. Among authors: karrar za.Ann Trop Paediatr. 1984 Dec;4(4):229-31. doi: 10.1080/02724936.1984.11748341.Ann Trop Paediatr. 1984.PMID: 6210040