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Unfortunately the original version of this article  contained an incorrect reference.
Reference number 45 was a duplicate of reference number 43. This should have read:
Adam O, Makkawi T, Kannan A, Osman ME. Seroprevalence of rubella among pregnant women in Khartoum state, Sudan. East Mediterr Health J 2013;19:812–15.
The online version of the original article can be found under doi:10.1186/s13104-015-1711-x.