HemorrhoidectomyHemorrhoidsSurgical StaplingDiathermySuturesAnal CanalDigestive System Surgical ProceduresPostoperative HemorrhageFissure in AnoPain, PostoperativeElectrocoagulationOintmentsAnus DiseasesUrinary RetentionLigationHospitals, CommunitySuture TechniquesPain MeasurementHong KongTreatment OutcomePostoperative CareColonoscopyCosts and Cost AnalysisLength of StayPostoperative ComplicationsProspective StudiesChi-Square Distribution