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Ahmed HA, Abu-bakr NH, Yahia NA, Ibrahim YE.Ahmed HA, et al.Int Endod J. 2007 Oct;40(10):766-71. doi: 10.1111/j.1365-2591.2007.1283.x. Epub 2007 Aug 22.Int Endod J. 2007.PMID: 17714468