Colonic PolypsConstipationPolypsIntestinal PolypsColonography, Computed TomographicAdenomatous PolypsColonoscopyColonic NeoplasmsColonLaxativesAdenomatous Polyposis ColiDiverticulosis, ColonicRectal DiseasesAdenomaNasal PolypsDefecationSigmoid DiseasesGenes, APCGastrointestinal TransitCatharticsRadiographic Image Interpretation, Computer-AssistedColonic DiseasesIntestinal MucosaFecal ImpactionColorectal NeoplasmsGastrointestinal MotilityRectumEncopresisDefecographyColonic Diseases, FunctionalIrritable Bowel SyndromeFecal IncontinenceSenna ExtractMegacolonAnal CanalAbdominal PainGastrointestinal AgentsManometryRetrospective StudiesChronic DiseaseEnemaBiofeedback, PsychologyLoperamideSensitivity and SpecificityToilet TrainingColonic Pseudo-ObstructionLactulose