Gastrointestinal DiseasesDepressionPrevalenceQuestionnairesSeverity of Illness IndexPsychiatric Status Rating ScalesBehavioral SymptomsSymptom AssessmentAnxietyTreatment OutcomeProspective StudiesRisk FactorsDepressive DisorderQuality of LifeFollow-Up StudiesTime FactorsCross-Sectional StudiesHallucinationsUrination DisordersFatigueComorbidityAffective SymptomsGastroesophageal RefluxLongitudinal StudiesDelusionsPainConversion DisorderPsychotic DisordersCoughMagnetic Resonance ImagingSchizophreniaPsychophysiologic DisordersCognition DisordersConstipationAge FactorsStress, PsychologicalTomography, X-Ray ComputedIrritable Bowel SyndromeSchizophrenic PsychologyAsthmaRetrospective StudiesCohort StudiesNervous System DiseasesSleep DisordersStress Disorders, Post-TraumaticSyndromeDyspneaSex FactorsIrritable MoodNeuropsychological TestsChronic DiseasePremenstrual SyndromeHot FlashesOccupational DiseasesDizzinessDyspepsiaHeartburnSomatoform DisordersAntidepressive AgentsPsychometricsPrognosisAbdominal PainDiagnostic and Statistical Manual of Mental DisordersCase-Control StudiesPersonality InventoryAnxiety DisordersMental DisordersRespiration DisordersSleep Disorders, IntrinsicPredictive Value of TestsLower Urinary Tract SymptomsLogistic ModelsDyspareuniaDiagnostic Techniques, Digestive SystemRegression AnalysisAcute DiseaseDepressive Disorder, MajorParesthesiaDelayed DiagnosisColonic Diseases, FunctionalHealth SurveysMusculoskeletal DiseasesBipolar DisorderPhysical ExaminationUnited StatesAffectMood DisordersIncidenceRecurrenceDissociative DisordersSelf ReportBrainDisease ProgressionRespiratory SoundsSleep Initiation and Maintenance DisordersParkinson DiseaseVomitingHealth StatusRespiratory Tract DiseasesReproducibility of Results