HemorrhoidectomyHemorrhoidsSurgical StaplingDiathermySuturesAnal CanalDigestive System Surgical ProceduresPostoperative HemorrhageFissure in AnoPain, PostoperativeElectrocoagulationOintmentsAnus DiseasesUrinary RetentionLigationHospitals, CommunitySuture TechniquesPain MeasurementTreatment OutcomePostoperative CareHong KongColonoscopyPostoperative ComplicationsLength of StayCosts and Cost AnalysisProspective StudiesChi-Square DistributionRetrospective Studies