Abou-Zeid AA. Anal fistula: Intraoperative difficulties and unexpected findings. World J Gastroenterol 2011; 17(28): 3272-3276 [PMID: 21876613 DOI: 10.3748/wjg.v17.i28.3272]
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Ahmed A Abou-Zeid, MD, Professor in Colorectal Surgery, Unit 6, Department of Surgery, El Demerdash Hospital, Ain Shams University, Cairo 11566, Egypt. ahabaz@hotmail.com
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