IleusGallstonesIntestinal ObstructionIntestinal FistulaBiliary FistulaJejunal DiseasesCholelithiasisIleal DiseasesSigmoid DiseasesCholecystectomyGastroscopesTomography, X-Ray ComputedIntestinal Pseudo-ObstructionGallbladderLaparoscopyBileCholecystolithiasisMeconiumBile PigmentsCholecystectomy, LaparoscopicGallbladder DiseasesRetrospective Studies