[Covered (subcutaneous) internal sphincterotomy in fissura ani].

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@article{Gemsenjger1972CoveredI, title={[Covered (subcutaneous) internal sphincterotomy in fissura ani].}, author={Ernst W Gemsenj{\"a}ger}, journal={Helvetica chirurgica acta}, year={1972}, volume={39 4}, pages={427-32} }