Abdomen, AcuteAbdominal PainAppendicitisSevere Acute Respiratory SyndromeTorsion AbnormalityAcute PainDiverticulitisMesenteric LymphadenitisSARS VirusDiagnostic ErrorsRadiography, AbdominalAcute DiseasePancreatitisJejunal DiseasesCholecystitisDiagnosis, Computer-AssistedPainRupture, SpontaneousColonic DiseasesAppendectomyEnteritisAbdomenIntestinal ObstructionPeptic Ulcer PerforationMedical History TakingPeritoneal DiseasesTomography, X-Ray ComputedAmylasesPhysical ExaminationChronic PainPain ManagementSpike Glycoprotein, CoronavirusProspective StudiesPain ThresholdPancreatitis, Acute NecrotizingAntibodies, AntiphospholipidPain, PostoperativeEmergency Service, HospitalPain MeasurementBack PainPain, IntractableLow Back PainRetrospective StudiesNeck PainSensitivity and SpecificityPelvic PainCoronavirusPain PerceptionCommunicable Diseases, EmergingNucleocapsid ProteinsFacial PainTreatment OutcomeIrritable Bowel SyndromePain, ReferredGastrointestinal DiseasesSeverity of Illness IndexConstipationIleal DiseasesCoronavirus 229E, HumanViverridaeDisease OutbreaksShoulder PainMusculoskeletal PainQuarantineColonic Diseases, FunctionalChronic DiseaseHong KongVero CellsCoronavirus InfectionsViral Envelope ProteinsColitis, IschemicInfectious Disease Transmission, Patient-to-ProfessionalVisceral PainCercopithecus aethiopsAnalgesicsIntestinal PerforationTime FactorsCecal DiseasesPancreasIntussusceptionDiarrheaAntibodies, ViralFollow-Up StudiesFatal OutcomeNociceptive PainNeuralgiaLaparotomyPancreatitis, ChronicMultiple Organ FailurePatient IsolationAnalgesics, OpioidFlatulenceRecurrenceIntra-Abdominal HypertensionHemoperitoneumDouble-Blind MethodEndoscopy, Digestive SystemAppendix