Nicholson, G Modification of examination couch for sigmoidoscopy. [electronic resource] - Lancet (London, England) Jun 1979 - 1273 p. digital Publication Type: Journal Article ISSN: 0140-6736 Standard No.: 10.1016/s0140-6736(79)92231-1 doi Subjects--Topical Terms: HumansPostureSigmoidoscopes