Patient SatisfactionJob SatisfactionPersonal SatisfactionQuestionnairesPain, PostoperativePain MeasurementAnalgesia, Patient-ControlledTreatment OutcomeQuality of Health CarePhysician-Patient RelationsConscious SedationHealth Care SurveysMeperidineConsumer SatisfactionProspective StudiesFentanylQuality of LifeBupivacaineAnesthetics, LocalAnalgesics, OpioidDouble-Blind MethodCross-Sectional StudiesPropofolTime FactorsHospital-Patient RelationsReproducibility of ResultsFollow-Up StudiesRetrospective Studies