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Rigid or flexible sigmoidoscopy in colorectal clinics? Appraisal through a systematic review and meta-analysis.Ahmad, Nasir Zaheer; Ahmed, Aftab; Letterkenny General Hospital, Letterkenny, County Donegal, Ireland. email@example.com (2012-06)Rigid sigmoidoscopy is sometimes performed at first presentation in colorectal clinics. We assessed the feasibility of flexible sigmoidoscopy in similar situations by comparing it with rigid sigmoidoscopy as a first investigative tool.